Malicious PDF — malware analysis report

Static analysis result for SHA-256 2902a3817b14b43d…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 23:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a1f74697d2b2ff472607da51b314b0 SHA-1: 21aa9caea46d2e3cfcb0a45691c78cf370fad73d SHA-256: 2902a3817b14b43dec0767c3714bf0d03917ba8e71ac718c7e93bd0ad46e1637
186 Risk Score

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 designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure points towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://fokemale.ru/123?utm_term=chitra+tripathi+photo
    • http://zevewidojodot.mywebcommunity.org/8242033700.pdf
    • http://gixapedotamerow.mywebcommunity.org/nizamumagizobuwupifijiwo.pdf
    • https://cdn-cms.f-static.net/uploads/4465930/normal_604b31f290fa8.pdf
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/babivajovane.pdf
    • https://cdn-cms.f-static.net/uploads/4426571/normal_6022270d6c3bc.pdf
    • http://figuxovutofid.mygamesonline.org/dapepofol.pdf
    • https://cdn-cms.f-static.net/uploads/4381988/normal_60174611de713.pdf
    • http://wozilimesiz.mypressonline.com/html_to_library.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/xuwinuvefebete-nusiz-zudodojorabi.pdf
    • https://cdn-cms.f-static.net/uploads/4444864/normal_601ae8bd9d230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5fdd3c71-eac8-4d67-9852-d6c1edac7d65/calculus_8th_edition_textbook_answers.pdf
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_2a6369d4c70f44c7a5c31994f7d580a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/727434be-f6ff-41ec-88b4-7e7bf46cc3c9/15080607642.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_b87e17bb431d48c3b4cbf2bc3367dd05.pdf?index=true
    • http://zipulosi.atwebpages.com/nijibowukedatokimib.pdf
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_8de27506667747cb9999628b754523af.pdf?index=true
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_4b7d4d1ca3b8474e9433972b72cb4c10.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_42d8ea2f687140e49180465c960220e4.pdf?index=true
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_196c51afa8ac4441976828792cd9e947.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5fc3059-d8ce-4ed1-90a3-f2e2f2a9cd46/gleim_private_pilot_book.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_507d5db7b13a4bacb9a2cb4608840ce0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e244.bin
9eb20e282177a9c334e96011a63d7cee8cb8eac4bb93389b8da90bfb05e7b601
pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 4600 bytes
font_01_sfnt_off0000f1d9.bin
bce8c0aa21a3ba966c009b90e648c877032c2badbb4201d73731559d3086d51d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 10800 bytes
font_02_sfnt_off000116d7.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 16036 bytes