Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae97b2f88bb13d1…

MALICIOUS

PDF

105.4 KB Created: 2021-06-08 06:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fb90e2e90244cee8c338d2851def03fc SHA-1: 9e1813880253e60387bd11d50d084a311fd5d8c0 SHA-256: 6ae97b2f88bb13d1cd42a7d213f7592f5b47de368e1f1b22a500a0d6929458bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/pbw?utm_term=acupressure+books+free+download+pdf+in+hindi PDF link annotation
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/kuzilusuv-negubi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380523/normal_60b5776133d56.pdfIn PDF document text
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/7815388.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/suxaju.pdfIn PDF document text
    • https://vanuseru.weebly.com/uploads/1/3/5/3/135350539/fesizexebapit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5fd9dc2282cb9.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/e51a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_601dfda0ae02a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18abbd7a-f81b-416f-863a-3797fd62b5ab/88491699789.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144654570/mario_world_download_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80a93ac-c041-47aa-881c-e9c59db03b63/eva_luna_elenco_completo.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/29469240292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06721b1a-162b-4450-96bb-b89426932ec3/69093142537.pdfIn PDF document text
    • http://jananevava.pbworks.com/f/acids_bases_and_salts_class_7_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb610da-5d8c-4afd-b395-c6eafbe34b85/lopulev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e8ef17-9759-47f9-93bd-11e306110c39/6027797865.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144782073/5345498304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b976859e-0d10-4a4c-8d55-1492b1d2e1a8/78016880190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260cfb78-54dc-4638-9c6b-7db2f10499c1/xufefowomalatevu.pdfIn PDF document text
    • http://pusurupufem.pbworks.com/f/algebra_1_simplifying_radical_expressions_worksheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00013f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 5528 bytes
SHA-256: b31d05ba289aa549348b4d968956c661e841b8e796e2be5e04e16718f7ab4401
font_02_sfnt_off00015232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 15460 bytes
SHA-256: 104ecb621adda19cabe2fcfd70784e5744404d196d5f98a19fd772bc80b37c75
font_03_sfnt_off0001820d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1820D 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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