Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc8e709a74ad34c…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb56fd19f9426eb126b71cd2971dea00 SHA-1: 70da8b0c5081e4fbdde01f4ff0ea92d8f1c91c2c SHA-256: 0fc8e709a74ad34ca2f193c483db82a75dfac66ddf93b4824a8a8e58b0ea63d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are designed to appear as SEO-optimized content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=dream+from+my+father+barack+obama+pdf
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5ff9285984184.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/towigedutosa-dinagafed-bobugi.pdf
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/wixotesuzi.pdf
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5fe9e77f2001d.pdf
    • https://cdn-cms.f-static.net/uploads/4449014/normal_604919723e8ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_48b3eaba37b146d2ba05a09342015e23.pdf?index=true
    • https://s3.amazonaws.com/vibuvomomuv/foursquare_city_guide_apk.pdf
    • https://s3.amazonaws.com/juzewojavomofew/2534681293.pdf
    • https://s3.amazonaws.com/dotivaf/zilukiwegogusesikupuket.pdf
    • https://s3.amazonaws.com/tomaxade/galway_gaa_match_reports.pdf
    • https://s3.amazonaws.com/jalasilunaz/26893399479.pdf
    • https://uploads.strikinglycdn.com/files/789d6509-0aa9-4bae-927b-1eef38cf17e5/nudafarufunuxanuru.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_d9f08ccb34f7409c8484eccc2dd8c226.pdf?index=true
    • https://uploads.strikinglycdn.com/files/776b4682-1c43-4915-9869-5cb55c5c3712/beats_solo_pro_wireless_headphones_price.pdf
    • https://s3.amazonaws.com/zurovajij/72487491738.pdf
    • https://s3.amazonaws.com/nerugiraxura/merivalivoganomid.pdf
    • https://uploads.strikinglycdn.com/files/9daeb95c-5f5f-4e55-b150-5d9e0344ebfb/how_hard_is_it_to_learn_egyptian_hieroglyphs.pdf
    • https://s3.amazonaws.com/jeponowon/homework_check_off_list_template.pdf
    • https://uploads.strikinglycdn.com/files/55c560d6-fc2e-44fa-b195-9621f592de78/management_theory_and_organizational_behavior.pdf
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_8a4281f3f3ac4165a90beb6c56eb04bb.pdf?index=true
    • 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_off0000f1c1.bin
031e919296158f9896d066c374a3eab7a8d9caaa5da479e63d5c7a6d7b33b128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5488 bytes
font_01_sfnt_off00010451.bin
0a699db3cd3f6817f73ead23738440574bf204b7b9cac680068db9a35749ca7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10960 bytes

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