Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadf3841f90e1179…

MALICIOUS

PDF

64.4 KB Created: 2021-01-17 05:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53dd91a28be1437299a968072076063f SHA-1: a30db6b18236c0261b35818f515e48177bb630b2 SHA-256: dadf3841f90e1179c64d9a0c7481f29e7d24e06d01d3ac8ccc030051ef97a468
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a potential redirection to malicious content.

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://trafftec.ru/aws?utm_term=subject+and+predicate+worksheet+pdf+grade+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fb2df67adaaa.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/afe7c255f8dd3c.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/hfzt7bY/13926693563.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/JehcjfI/what_does_sadad_mean_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/haQifNT/nhl_games_online_free_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/J4QCgdg/76392671041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fbfe2cf1e8da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fef1634ab557.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/siwoladatetawegi.pdfIn PDF document text
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/74e82a1128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fcd53e35379d.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/iftz5ic/hills_of_steel_apkpure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 5912 bytes
SHA-256: 1238cf64d491031370f9fd066f8d129e8ba8e67ef56c9b9e1ce0f425bf950b23
font_01_sfnt_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 10696 bytes
SHA-256: d7912357bb4a229212ade8c7ae16b436640873ea13284cdd2360ec7ea4e5ce17

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