Malicious PDF — malware analysis report

Static analysis result for SHA-256 4407e2b0a1a15ec1…

MALICIOUS

PDF

73.1 KB Created: 2021-02-05 23:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5d576e8f1c70e4d50412fa0b59d961f SHA-1: 1c3e126fb0450a939b9049432d19680b52bd0731 SHA-256: 4407e2b0a1a15ec1d56cc3fde74b89e2ebb181af228dd08fa8856eb0aa87a587
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'link farm' heuristic indicate the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/123?utm_term=bert+smith+bmw+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fe53009d3da3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413983/normal_5fec066501a6f.pdfIn PDF document text
    • http://pelistens.xyz/xakijodunuxogoxapegonafawwd4lo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494146/normal_6005ab979cc28.pdfIn PDF document text
    • http://matteset-spon.space/billy_collins_introduction_to_poetryn5vuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fda606031849.pdfIn PDF document text
    • http://rollernefritmassage.xyz/super_starfish_all_fish_20198hw51.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/satudifin/vufuxopejifatuselarer.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/information_on_anthrax_bioterrorism.pdfIn PDF document text
    • http://wexejof.epizy.com/13844657819.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/word_doc_quote_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/apple_pie_apk_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/21515020370.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/calendar_week_2018_template.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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 5308 bytes
SHA-256: a03b91ecd42f91de5efb20d0a3eb4380b8d6a0ec58268507625ae42c2dbf2db6
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 11000 bytes
SHA-256: e4d37a9127085260e4a11eb907e8c79ec444a5ff9bfef48cbd7fdcb5b208396c

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