Malicious PDF — malware analysis report

Static analysis result for SHA-256 972e4475a404bda7…

MALICIOUS

PDF

73.5 KB Created: 2021-04-26 20:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c19d2be0116108799d124107f5d44c66 SHA-1: 2e36b4495f44e0259372e751d87b6e4ab06c5a94 SHA-256: 972e4475a404bda72a0a6061eababf8f8d7d6fbd824cbce9411c9dcb68f64e3d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://baarspo.ru/strik?utm_term=less+than+zero+book+cover PDF link annotation
    • http://theandyhong.com/benetton_ad_2019ow9hg.pdfIn PDF document text
    • http://leaninrzpd.site/sotepeti59k0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6011192736fbc.pdfIn PDF document text
    • http://hookup756.fun/nikon_sb-800_manuale_italianop536g.pdfIn PDF document text
    • http://storeyou.store/netgear_wnr2000_specsqprw8.pdfIn PDF document text
    • http://trokot-new.online/dimenefapusmvc01.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ifjj1I2/baby_shark_run_away.pdfIn PDF document text
    • http://naturebiolog.space/fekafefekazawogiwmbo58.pdfIn PDF document text
    • http://copalofa.site/84048622583exe3c.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/Ezk8ifn/child_care_package_nsw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_602efe7a5464e.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/64Oe6jp/halal_food_guy_restaurant.pdfIn PDF document text
    • http://tamakar.xyz/791210484231vuyo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_6004140ab198c.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/cLgjMib/zolonutililu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_7a5c06b597964a28b826c6149bf9aa64.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_5db510bf01d94f4da798311212bb0043.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_ff70f72e4a4042c6915f4d69f70182b9.pdf?index=trueIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_22ff9404e9ce400f95b298ec339cd5a5.pdf?index=trueIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_f906f3848dc14a0db0614c9d975096ff.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_1a8ac1f6f3224e32a0f0d0f17e945052.pdf?index=trueIn 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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 5108 bytes
SHA-256: 33f2b9ca4f7b2bda635dce40519976f1bcc358b728d10abf7e3f585b57c7f0db
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 11320 bytes
SHA-256: 52949da3f84791b24e1d6796be49f52a8ca6c89aacdc058a6edcfee97a7798cd

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