Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f94d72422c7e735…

MALICIOUS

PDF

62.4 KB Created: 2020-12-23 03:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1f9f6582943808544569ba54e1516d4a SHA-1: d8a631246aa99c64b8914f8fa110d0efb7628d2a SHA-256: 1f94d72422c7e735d52839cacb18a3050b442a1db0ed79ee584f7629e70c0664
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. 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 heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=pony+club+manual+2 PDF link annotation
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/walisoxewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5fd727fab259f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f90bc1de7374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f9697dc6002c.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/dibedamoka/chottanikkara_amma_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/weather_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/91785595338.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c69c88c99b6d37b36994/t/5fc51f60145a8629dc54ae7d/1606754146156/78054655413.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4fdc5239b0722914b73e7/t/5fce33c6662d5e24e0cd3b8a/1607349191275/nuxowojapezijimeni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe148e922d7684816731abf/t/5fe1ab3ac70e3835b6f4e8e5/1608624955878/possessive_adjectives_french_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdec2d1f51818731100bc67/t/5fdf76907f4e6a336735e42d/1608480400851/41400672613.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/analyzing_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/90099352919.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_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 5044 bytes
SHA-256: 2bd1c64cf7bfa69f25fba6bea425e15834040790464c45a998b9d1a66c8abfe4
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 10776 bytes
SHA-256: fbf2c6398fe0826c8646b3c12c7c20694aa8aa01b7c612fe16ce74de3a1b554c

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