Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfd7343106ef310…

MALICIOUS

PDF

82.3 KB Created: 2021-03-23 23:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f8836e02af1bd832c11233108b59af0 SHA-1: 7c424b29a615f034201aa108fec5bac355a89c92 SHA-256: 3cfd7343106ef31098b421dd3138cf3c4c57aebf1f74342f55a29eede9409d1c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other file-sharing services, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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=1611+brass+container+with+handles
    • https://cdn-cms.f-static.net/uploads/4462726/normal_604468a90f45c.pdf
    • https://static.s123-cdn-static.com/uploads/4385853/normal_5ff026390ef9b.pdf
    • https://cdn.sqhk.co/zovaratigu/3PMgdxJ/konajutipobopeto.pdf
    • https://cdn.sqhk.co/sewadokoka/gMbjaje/dynasty_warriors_9_gameplay_pc.pdf
    • http://jumufedug.22web.org/52795973752.pdf
    • https://cdn.sqhk.co/gasupewu/jj10iig/school_health_and_nutrition_jobs_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4460461/normal_602787ada6447.pdf
    • https://cdn.sqhk.co/nonuripot/jgcVgwF/character_story_planner_2_timeline.pdf
    • https://cdn-cms.f-static.net/uploads/4470222/normal_603ecd7c4ebc9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nelizenejakarug/wafosagija.pdf
    • https://s3.amazonaws.com/gazijewevan/mawitolemazef.pdf
    • https://s3.amazonaws.com/fadupazageraf/6243785992.pdf
    • https://s3.amazonaws.com/fowikorejodi/modagisitukili.pdf
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_28bcbd78ddba4bc6a72e5df3f526dafd.pdf?index=true
    • https://s3.amazonaws.com/dazovosugev/89996649335.pdf
    • https://s3.amazonaws.com/wujapu/florida_drivers_license_study_guide_quizlet.pdf
    • http://senoburem.epizy.com/71930051013.pdf
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_0361fd4581c040edbeb41400bed4ade5.pdf?index=true
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_a4434e5ede014806834014d128924582.pdf?index=true
    • https://s3.amazonaws.com/wukevirenesu/game_of_thrones_head_of_the_dragons.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/a_simple_favor_movie_rated_r.pdf
    • 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_off0001068f.bin
0abc6d7a63dcd3b558c050a2df4c7620f506266cb3cd8ec160f064032358fe94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5372 bytes
font_01_sfnt_off000118d7.bin
7b5e22e0bc7f7da086b64dd7f5407ca6d7972c388ca4108e69d51d536cd3e449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 10268 bytes

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