Malicious PDF — malware analysis report

Static analysis result for SHA-256 a663bed379c5322b…

MALICIOUS

PDF

61.5 KB Created: 2020-12-17 03:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9133408619005679f1d5380f5f3b36d1 SHA-1: 956eb764905bc1840e088e57b3f177ac0fb65441 SHA-256: a663bed379c5322b94e7b2994b2480c115e21da0fb5014efda1485f2c5827549
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary one pointing to 'traffset.ru'. Heuristics indicate this PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://traffset.ru/strik?utm_term=fyi+for+your+improvement+6th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5f9c806dd062e.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/kitoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_5fbe3def6ba6f.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/3240f48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fc54f53e4189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_5fd79e94ebf24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f90b556172c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f9a11e5d5d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f913d1d7f913.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/6eb317ab9.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/6403067.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/wazorixekunafob/surapasakevutemobetoxona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb18d70a-e555-4146-a1f8-b64d517a9a68/72738191088.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 5132 bytes
SHA-256: 3d11c4028d06c8a092f8e0b6e4aed62a9f6fc6ae984a89f4905af08fc563795a
font_01_sfnt_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 11540 bytes
SHA-256: 799482497a634e458b7c4598c2cab4c240d2da2d6e329a38fddd0410441db809

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