Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e553900386fd72…

MALICIOUS

PDF

75.8 KB Created: 2020-12-19 11:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0cef3ea4baf268184338c56a319fefe7 SHA-1: c123d486d1310b21babedecf31f6925c06438975 SHA-256: d6e553900386fd7220ebf53bb8531f745f9c87a3d4a226db8ea95675ad07994f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, many of which are hosted on S3 buckets with generated slugs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffmen.ru/aws?utm_term=bangkok+university+uniform'. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=bangkok+university+uniform In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fd3820860bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5fa09dad5a043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f876161d41fb.pdfIn PDF document text
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/tubofidiraboju_bogetapuleroj_rugog_zevulezidipow.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/3721208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_5fd90b89206dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5fdc64738c904.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/sunirexenonalogeseto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/vawoginele/tactic_for_toeic_practice_test_1.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/website_developer_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/32436865817.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/94894423333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657554ac-8b08-4fb7-9ae3-7da38e0755c9/4829500204.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 5328 bytes
SHA-256: b40872c6fed642bce5b12a517f0ecdc54021587de6425b0e09d3f373b4f1796f
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 11364 bytes
SHA-256: 55b204bd2a28047a305c8e94c4e0e829c7fbc812425f2863d00995eb0839bb50
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 13832 bytes
SHA-256: b201c5032dabc7c1358897dcbaac5b6343b54f01b9c4569cbd08db4e1366cf82

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