Malicious PDF — malware analysis report

Static analysis result for SHA-256 7595aaa362f1b051…

MALICIOUS

PDF

75.0 KB Created: 2021-01-17 02:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 77b5116c4f264624e7fc9a1305db98ed SHA-1: 9137789040ce45a5fe9a67d8e3de9b84f1d34515 SHA-256: 7595aaa362f1b051a0de406be94e9f9b31f88ac54cb67789d088ac2b3d1423cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is trafffe.ru, which is likely used to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

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://trafffe.ru/123?utm_term=unit+2+chapter+14+ap+gov PDF link annotation
    • https://cdn.sqhk.co/kuzezajolu/cjirIWR/brasfoot_2019_premium_apk_gratis.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/sejenofawokav-tipis.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/xakaxaxevedavugoja.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/tobito/16655809573.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/the_great_bridge_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/41167294791.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/tafamupok.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/umich_cse_course_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/bat_rolling_machine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/dogig.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/bypass_google_drive.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 5308 bytes
SHA-256: b9764d6cfd4746e19bdd7940be3e82902b71b3031df4402dec6f90e74fef2574
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10376 bytes
SHA-256: 03ce126dfdc7fc399f378014c78a75c39521c442b7dadb1a0b98d8fd93186026
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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