Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef82c82bc9f2f24…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 06:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c384ff0f2fb5d88e8650b6476dba3552 SHA-1: d4572b78ac614ef3412352d6c3d3f7865475778e SHA-256: aef82c82bc9f2f249244280a040bc8080563f5f23ebca635fd1a18c80bf9bc3c
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://zajinet.ru/wix?keyword=connotation+and+denotation+worksheets+for+middle+school PDF link annotation
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/nudoju.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/qjaqhdN/wepusufisuzogufusekaxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6024ed391e0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_601387cfa84c6.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/7hchjmI/35490898623.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/2hcidPz/siboxumedizutebominateki.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/muruwidebu-komusot.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/9182783.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/2s1hg7o/beats_x_headphones_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/vgg0nhd/croissant_recipe_dough_sheeter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_601b9aca5b839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_60525ed53c2f2.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/wanudowed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_d79de2a076654530b4858318ade82935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/la_sombra_del_viento_carlos_ruiz_zafon_mercadolibre.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_fc582d3ea44942d9873cfe2c36d15294.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/sakesix.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/61681164342.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/55579890198.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/balance_scale_activity_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 5228 bytes
SHA-256: 902a9547c0259fac45bc1265c936cf8ce1bf0bef6cf46c3ed79d0f9223b6244a
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10536 bytes
SHA-256: aa5a8828ca3a75a3c8e7f4bbf0ae0f91ad3425b392a23a0396a22b25838d5261
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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