Malicious PDF — malware analysis report

Static analysis result for SHA-256 004661c0eec8d2b1…

MALICIOUS

PDF

76.4 KB Created: 2020-12-31 12:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 76eed7a41609e61e540508690c625dd6 SHA-1: eb414b26a78f719bd588b86a0d48b301b608dff2 SHA-256: 004661c0eec8d2b16662465ef7ec7aef623cd44421060c141f29201b997ce763
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://trafffe.ru/strik?utm_term=learning+english+for+free+near+me', is directly associated with the malicious verdict and heuristic firings. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs indicate an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=learning+english+for+free+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fbd60c237ca1.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/xofitadulaka-zolifupiduzotor-sodefaz.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/vofubogefozuk.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/iihgid1/83567008039.pdfIn PDF document text
    • https://juwatupajevofa.weebly.com/uploads/1/3/4/7/134705275/dazaraparup_wamekopoler_xaxoserunigesu.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/7638898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fc7bd1072eb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jozetej/all_helping_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/history_3_make_your_days_count_ep_2_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865eb972-75c6-4592-bf4b-7fc4e8fd556b/tibado.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/31415317997.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/30306350653.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/19948991022.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/99988269750.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 4828 bytes
SHA-256: d0249c4c95f512d22f500eb84cc258985730baab9b69384b5604f4dd8952f504
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10420 bytes
SHA-256: acb732ccc7f8acfbfea21c669bcb38b3e4ea156a56ec0084352fa62d4e6dce3e
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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