Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c73684e27f8a1af…

MALICIOUS

PDF

103.6 KB Created: 2021-03-28 01:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f807a77172a85701619be9facd2bb6ed SHA-1: 53b760507e6c804cc93870dc0d713961e8eb0017 SHA-256: 7c73684e27f8a1afbab6dfa8ba5f7b5fd7cc2786632518ad3c6f86a152879892
164 Risk Score

Malware Insights

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

The PDF file contains a mass external PDF link farm, with one prominent link pointing to 'https://nipisod.ru/award?keyword=aplastic+anemia+review+pdf'. This, combined with the 'SE_INVOICE_LURE' heuristic, suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/award?keyword=aplastic+anemia+review+pdf
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60146b697c13f.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_603811b264150.pdf
    • https://cdn-cms.f-static.net/uploads/4420599/normal_605cbdcfc9edf.pdf
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5ff57eda4c777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/didowugorokirug/82172234525.pdf
    • https://s3.amazonaws.com/kudowo/bocasalina_formentera_prenotazione.pdf
    • https://s3.amazonaws.com/meludav/98496213500.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/xibowete.pdf
    • https://s3.amazonaws.com/jalasilunaz/89600858711.pdf
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_600bb61bceee460f8ed448c946057d32.pdf?index=true
    • https://s3.amazonaws.com/vipuxafol/15338053366.pdf
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_fb471cc7e732425ab99699f885271356.pdf?index=true
    • https://s3.amazonaws.com/kovezodepugov/96232092028.pdf
    • https://s3.amazonaws.com/divelatoxa/43086689566.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/bluestacks_free_for_pc_2015.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/genero_literario_de_el_caballero_de_la_armadura_oxidada.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_8b81c313effd4b0e9016d7f2f80cee0a.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_65a34844dda34b65be5fc4ce5be6a4bd.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_34a9233ce77a43e3a0ad141e2c50c39e.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_61f406457c3040babbaef8b2cae56f56.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/greetings_island_invitation_template.pdf
    • https://s3.amazonaws.com/xapijifas/brothers_in_arms_2_mod.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
    • 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_off0001437b.bin
44dde4966c88ff94b97dee7582abff8d55b04f887c5c78a113e72781bf91608d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 5440 bytes
font_01_sfnt_off000155fa.bin
e756a5e7845f5e1d597c045cab2ed1ef3cb40cc69d010881fb5326e9f42c0d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155FA 10900 bytes
font_02_sfnt_off00017ba6.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA6 16060 bytes

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