Malicious PDF — malware analysis report

Static analysis result for SHA-256 60aa066e698d7455…

MALICIOUS

PDF

89.4 KB Created: 2021-01-13 13:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e8c9155ca24e287322aaa73d595ee5d5 SHA-1: 8149c65045879d4ffe0b24bff971629ab19903e6 SHA-256: 60aa066e698d7455fb032a7fd88dc4dc0c27bb9e838752a05e17e29d5f59b86e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or a method to distribute further payloads. The primary external URL, https://trafffi.ru/aws?utm_term=ielts+writing+test+topics+with+answers, indicates a lure related to IELTS writing topics, likely to trick users into visiting a malicious site.

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://trafffi.ru/aws?utm_term=ielts+writing+test+topics+with+answers PDF link annotation
    • https://cdn.sqhk.co/vosizijanad/fjegeha/vilegizujapavadenolijoxu.pdfIn PDF document text
    • https://sojikopel.weebly.com/uploads/1/3/4/7/134760404/vuzatib-pikemiwo.pdfIn PDF document text
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/4626932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_5fd6f4785ae7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f873df5a5a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5faf52a89d54e.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/1599982.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/pajukovuxetu/10830638153.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/guide_classes_diablo_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/best_free_ringtones_for_android_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/bylaws_for_nonprofit_organizations_template.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/bitutowonisatunif.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/aspectj_jar_for_spring_3._0.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_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 5224 bytes
SHA-256: af6fcde0ec113e7e1ea8310b477504be84c4b65ce6e22021a918199aecab29bd
font_01_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 10380 bytes
SHA-256: 5fbae0178a37d21d7b2ad0541bea9d2a1afcab4d06073f0d0e1e18ba34f8fcd0

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