Malicious PDF — malware analysis report

Static analysis result for SHA-256 0672f4e5c12eb65e…

MALICIOUS

PDF

74.9 KB Created: 2021-04-30 09:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 679e1a96ca841407975eb9ae8f98557e SHA-1: 821ad2caa07ad971b5d3aef057255c6bc2c0399d SHA-256: 0672f4e5c12eb65e4e5df4c70c828103007e334b03dbb87f6a0636163f2b726e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL being `https://jottigo.ru/strik?utm_term=programa+de+estudios+2011+primaria+sexto+grado+educacion+fisica`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is part of a link farm hosted on disposable domains, further suggesting malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=programa+de+estudios+2011+primaria+sexto+grado+educacion+fisica PDF link annotation
    • http://lavka-karamel.ru/78016636664eah56.pdfIn PDF document text
    • http://siluduto.22web.org/every_praise_chords_eb.pdfIn PDF document text
    • http://dezlice.ru/6515075115mj9uu.pdfIn PDF document text
    • http://smilex.club/bushwick_platform_bed_queen_blacknpf48.pdfIn PDF document text
    • https://ramabubutimelu.weebly.com/uploads/1/3/4/5/134597411/f08f579ea.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hafPijj/portals_tactical_2d_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/Tmmgg6B/59394716385.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/pozamabixo-madudel-tuzefoletefiwu.pdfIn PDF document text
    • http://kukushpa.fun/informagiovani_macerata_corsi_di_formazionemfm5m.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/gj9CgcJ/22312388843.pdfIn PDF document text
    • https://kawutakupilim.weebly.com/uploads/1/3/4/2/134236314/cc8bf5e.pdfIn PDF document text
    • http://ketadiets.site/70550675279rjpmm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bulijisir.rf.gd/tipos_de_centrales_electricas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7ccbf2-04b5-4431-8138-e88418f9bf76/kopemifomobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04abb48f-d7f6-4aec-a40c-827bc57b478c/tibiwikugenoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357c53f7-ed1a-4352-804b-12731436f0b8/wudufixut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe2ae4b-fa31-402f-96d9-fc1eea4266b7/lord_of_the_flies_study_guide_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182a10c0-1e13-40b5-a404-5941f2231ef9/66414282072.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 5836 bytes
SHA-256: 1e3eb3e60e878a30c7779de12fffa89a9e7aae1ea62154fcd57d041403c5b1b7
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 11680 bytes
SHA-256: ff65659adda2c76909921ed6ac3e9891843860a80766a1e4787c245070c88137

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