Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bce1305fde3736…

MALICIOUS

PDF

80.4 KB Created: 2021-02-28 10:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 03a62004982c96ff79116e92036201a3 SHA-1: b917efaab8e06dfbf1250ccb82664693b1e617de SHA-256: c3bce1305fde3736796a12a589231108a88ff14eb4662516acfc925e384ba59c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one identified as 'https://kuzutuzo.ru/wix?keyword=army+enlisted+ranks+quiz'. This pattern is consistent with phishing or SEO poisoning attacks, where documents are used to drive traffic to malicious sites. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=army+enlisted+ranks+quiz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366662/normal_60035df9770aa.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/hbqgggd/wijiwukimodefajep.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/aVhhxe4/hackers_movie_soundtrack_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_602ae2a96e431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_6031122715174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_600395c732aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ffaef44de58f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6022c7508bdb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_5fd780f5b91cd.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/eb8edb992688b.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/DAhfsiK/waziredovitosogeriwaz.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/hirccwF/50422929615.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/66c404e4c90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_600713719b2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_600e7ce6d9bae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sivanira/fezajomebefularuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/nyc_accident_report_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/91016690333.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/bidekolimanigorivibikiru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 5304 bytes
SHA-256: 9d5a8841642ba42527b6ad6417372937cb90a6d1561e30fd1bce0df03edb6f5f
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 15028 bytes
SHA-256: ea349070d8aa95b94369ad70c3c418aef0cecabe404f3fec53c3e43babbd777f

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