Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61539a437f98e82…

MALICIOUS

PDF

75.5 KB Created: 2021-04-06 21:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3bff01bc546a2dfa2d75cd3bfd905969 SHA-1: b0ab2567ada26f8fff577a8865e88cafaa89d675 SHA-256: f61539a437f98e82fd2850f437a7d1f5beba102fb79f93a42e44ec1cf5ab3ec8
186 Risk Score

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 0.9998

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://pelibifir.ru/wix?keyword=7.2+sectional+views+answer+key PDF link annotation
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/1688fd42b.pdfIn PDF document text
    • http://creditscoreusa.info/5005156006wgatk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_602a9e54ad0f7.pdfIn PDF document text
    • http://vsedlyatebya.xyz/52839154762uohjg.pdfIn PDF document text
    • https://dizodedijep.weebly.com/uploads/1/3/5/3/135391654/967d49d8d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_6048e58351305.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/7814493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_602e33c391f2d.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/f953d97f-62c5-420e-81b0-c8ca263fb559/pathfinder_kingmaker_ps4_review_ign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941625d9-3884-436a-93c4-57fbe60fd466/51561185527.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_151cec89631b441fa6e8abe3f0a9583a.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_5e2777f1346a489ca1c1bf990096ea38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba7cfcc-97f3-4618-b5f5-3a8e5996eb3f/what_does_size_30_mean_in_mens_jeans.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_205c0b44cbf9468cb8036288e5c623d0.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_c8e7f37f33b248b5ac866be7b788a914.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_ae23b964237341c4837d4a7175294373.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_f63313eaeb49441491b95a32c18bd321.pdf?index=trueIn PDF document text
    • https://78de399b-5cb1-4d05-8290-e7933402b20f.filesusr.com/ugd/10f998_38167e80e80c4ea38398cd789370de68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/527af3c9-7999-4c86-8c5c-5fe77c51d898/metroid_2_map_nintendo_power.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5260 bytes
SHA-256: 380c7d28c7338af847554ad4c9535bd3f1aaaaf6bf6dd3d10bf442cc733cfa89
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10780 bytes
SHA-256: 816279ec4e4d52dc89c38dd26a0510a968ab0930261c131d8228dbf8c8e41289