Malicious PDF — malware analysis report

Static analysis result for SHA-256 3713b575d0deccc7…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 15:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3bf1c1e25f06a57a7791fb7aaab4817 SHA-1: 7222c72b0abecfd1bcf8b67089f71e5d54aaa5f5 SHA-256: 3713b575d0deccc777500aeb79606e467d241c88f65943313cc58dd3a7af8136
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text related to legal queries, suggesting a lure. Numerous external URLs are embedded, many of which are associated with link farms and disposable hosting, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=is+it+legal+for+cops+to+drive+unmarked+cars PDF link annotation
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/zevikuzefiremupux.pdfIn PDF document text
    • http://huseyincanx.com/what_is_the_etymology_of_oral_communication_in_businessvcejc.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/7fecfca.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/jZfKgd7/8441684646.pdfIn PDF document text
    • http://expo-kit.ru/what_are_the_properties_of_the_oceangr73z.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/igjgggc/25503328821.pdfIn PDF document text
    • http://xeeewq.xyz/abstract_algebra_3rd_edition_solutions2qzjt.pdfIn PDF document text
    • http://zathkatow.xyz/445320839dhen4.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/fQmsCjV/runitusofevapajidu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/ghwhfPf/mymathlab_homework_answers_2018.pdfIn PDF document text
    • http://alexandreablog.com/15074429591g9y0q.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/MgfjdLa/custom_keyboard_color_changer_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_2f3751f3f4ff41cc9d88080503153c21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e09596-c54e-4cc5-a027-1e7bfc58b4ef/xaxovakosagodosuluxogo.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_24c5fe886a7d487f878c9ddcb633e61a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/jekuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5c398c-3c40-4dfc-bf56-0f829f29c18b/jupamejogoxiderosajuk.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_3a20ca9d51514a2bb6070f811cd31013.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/68206253251.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/xabavujedofomesenemepuw.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5536 bytes
SHA-256: 70d1d1f04da0a1b2a707ae061bb367394ccdd265c3c110a3d4c2bec5d8b0ddcc
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 11252 bytes
SHA-256: 079ae612275ced223305acc178592e0b8b9b1927098e2c2845532bbae3660828

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