Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f276f3e1b6a8dd…

MALICIOUS

PDF

111.1 KB Created: 2021-03-15 00:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6da476e15b2d45d6b05e2d1e5a9c64a6 SHA-1: 27db9ebf11709cd8e5e5318350b4c1af812eb79b SHA-256: d6f276f3e1b6a8dd6b38cbceb068785065e70be5d1f9d39fa902416682648cbc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The embedded URL 'https://ponafet.ru/strik?utm_term=what+does+mournful+mean+in+english' indicates a lure to a malicious site disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=what+does+mournful+mean+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407789/normal_6049390ca5fb4.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/gixatujetoguz-zaxudoguvufile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fcda2c54e688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fd34d1f5e22a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_60206439467be.pdfIn PDF document text
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/9643837.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/6e6e6fcd7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6cd515ee2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe6c9f161869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fc5751727dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_600e28df5d135.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/94e61457c.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/47385501840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd0f2c10d092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_6023fcb0d6636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/wujapu/comparing_numbers_worksheets_3_digits.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/faxomimo.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/why_is_the_dryer_not_drying.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/how_much_money_do_navy_divers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/99633324439.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00018037.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18037 18176 bytes
SHA-256: 9a53eb0f5d899206140142024e1329928d04523b9b037af6ea44b3d64dff0b7c
font_00_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5684 bytes
SHA-256: d9df6945b54372b4ce1b038b385752c5e534dd56f39eb70cfae60a2504a527db
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 5332 bytes
SHA-256: 01173b82c40a9383de44558ed52d8f6d8677ecc037175f1477e847e2831978bb
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_04_sfnt_off0001341c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341C 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_05_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 6640 bytes
SHA-256: 538512be6c526ea957b587fa229624d829dca4873b622d187784a60d2c877fcd
font_06_sfnt_off00014f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 15924 bytes
SHA-256: e96789235f73cde30a9fa20c3c98e95933c85935feb08eacadaa81b239feb087
font_08_sfnt_off00019d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D04 3276 bytes
SHA-256: c12c670e310cd2dd0f4b1ea6ea0d01ef35e1284caa1cfc967b978b02bd897c09

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