Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7961ba4265394dd…

MALICIOUS

PDF

68.9 KB Created: 2021-01-11 10:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af00348ef984f7293affcfe3071305c3 SHA-1: e8df76f2106ee89c7dfe9c097df827a125a4f802 SHA-256: c7961ba4265394ddb20c292a5ab7a607f27161410d5b844fe511adcabd796f93
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files hosted on suspicious domains, suggesting a link farm or distribution network. The document body, though heavily obfuscated, indicates a lure related to 'Pro benefits health claim form', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffi.ru/aws?utm_term=pro+benefits+health+claim+form PDF link annotation
    • https://cdn.sqhk.co/kegetaxob/3CwuidZ/85656270151.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/fjdhaic/fashion_model_salon_time_management_wedding_shops.pdfIn PDF document text
    • https://site-1175068.mozfiles.com/files/1175068/vabasopo.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/5332557.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jcThkNO/recargar_claro_ecuador.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/ijvhcX2/77399000195.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/UYAjeEN/zumazowapibani.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/fasanag/mevusixixuruf.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/android_9_vs_8.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/harvest_moon_animal_parade_recipe_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/16635076849.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/madden_mobile_16_coins_generator_no_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/84267248405.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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 5260 bytes
SHA-256: 7f9640884c184bffe66d5f5e63b75e0fe03785623283e0bf49fadc03e8f36ccc
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 10292 bytes
SHA-256: 2ea8167a17287c6ac079f75f3407de46b2dd72e415316677a62fac999bb8043e

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