Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ca7c6c54cbf299…

MALICIOUS

PDF

72.4 KB Created: 2021-04-03 06:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75134627a9900861df3fa0fa139a60e4 SHA-1: b3516dd52191496054e1b8785f1e6d470af2aa32 SHA-256: 70ca7c6c54cbf29920b2269825b0cacab73d6721cfa60b472237a673f17a62ba
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The document body, though heavily obfuscated, appears to be a lure related to 'potential energy diagram worksheet answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=potential+energy+diagram+worksheet+answer+key
    • https://cdn.sqhk.co/kizusuvut/fhbhU4W/carbide_woodturning_tools_canada.pdf
    • https://cdn.sqhk.co/kofelejezem/heaiaha/tiremositituzejinalaxewez.pdf
    • https://cdn-cms.f-static.net/uploads/4403688/normal_602b45e543fe0.pdf
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6028245345065.pdf
    • https://cdn-cms.f-static.net/uploads/4483867/normal_602b0b3435c0f.pdf
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/raneresuk.pdf
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/zetuzuvajom.pdf
    • https://cdn.sqhk.co/guranotup/djahGgi/xupedumuxulomorowizulive.pdf
    • https://cdn.sqhk.co/zuxatotukaru/Qge17Cu/39295750875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_0454f5bc236c486894ed4f5dac8c1874.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b3cedbe3f6a449d5a9d8234931da0e9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c1cf186-0595-4d2d-abde-d5862cf10b1c/brandy_alcohol_content_percentage.pdf
    • https://s3.amazonaws.com/gofiguj/cake_mania_lights_camera_action.pdf
    • https://uploads.strikinglycdn.com/files/082f8520-99fd-47c0-b314-b23bcf98b559/asp_net_mvc_5_role_based_authorization.pdf
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_3d3cb8f3beaf4191995ba433fa460af2.pdf?index=true
    • https://s3.amazonaws.com/tevomenil/jojonarumagofunegotiku.pdf
    • https://uploads.strikinglycdn.com/files/06bc94e6-8396-4671-8939-42b1fa3bfb29/spanish_medical_interpreter_certification_california.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_3e8a98aafd92417697ca6ed8770d4224.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin
b48073c146acc6b13ae78a5acebb6e7115bc2bb3d1c7c0940a4e6a161afed660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5496 bytes
font_01_sfnt_off0000ef97.bin
5d721ae1944a731bfd79d7257afa91267354fa928da74d3ca57bde9f1dcc7953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10724 bytes

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