Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee11cb4b011638f…

MALICIOUS

PDF

106.8 KB Created: 2021-03-31 01:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c839fed433c8954786d6bc1a2c18776d SHA-1: 22afdabbbc7e807487c8fc5123c17c431f456a21 SHA-256: 2ee11cb4b011638fa0caaa5bdee032062f540f6c5da5d0af75f85dc187774778
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+play+the+game+joking+hazard PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5ff23b70dfb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_605a6ae21a167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5fd320e23f81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_6048402d28009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_6019ad7660c83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5feb7664cd128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6047adaa090df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_6030e86610b47.pdfIn PDF document text
    • http://kafedusoga.iblogger.org/spectra_s1_vs_s2_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e58264-9c3f-4f88-8cc2-ab009c3b23f6/guzuderutixelimobe.pdfIn PDF document text
    • https://dd70c91d-bff0-4db5-80ca-962f080bd6fc.filesusr.com/ugd/c34eac_c49996c79b774ee4a57ca4a5bfdfd100.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_1126aa06c05348ca91c0ab0bc144e48d.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_6f4b48c01a6642af8f0a27f895c4ba54.pdf?index=trueIn PDF document text
    • http://kapejod.rf.gd/chemistry_of_boranes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a97d7c-7a33-442e-9177-3fb8c1d455f9/3219395456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301a21a4-6cdf-4192-9355-d0598338f705/39325879836.pdfIn PDF document text
    • http://tefotifomasun.epizy.com/welazoxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62265c7a-5e13-4fe1-837c-f45bfeecff1b/what_age_group_is_maximum_ride_for.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_be708d11eda14480b61816b63f2ffc48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28af90a0-c4f0-41fc-b2af-4e12242833c8/vuxunubag.pdfIn PDF document text
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_c82850391e474699978f7c0bcf94ce0e.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_off00016145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16145 5540 bytes
SHA-256: d6685ea37542a544ceb62b3ff56249db3ce3a94bbcc294b0d7f3c8873948fe20
font_01_sfnt_off00017414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17414 11684 bytes
SHA-256: a31036f8b7284929b54f48a11a6311257b6b7128c2fd47fd00f20982113d453d

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