Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67891c29feba26…

MALICIOUS

PDF

99.4 KB Created: 2021-02-27 18:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ff2ffada1420f5f1cf4f239b7d096f6 SHA-1: 85dcd2843ecba75f4e5dd9870e5befb9e59072b9 SHA-256: 7a67891c29feba26a574b71a7f80f1f8efa80674f89d7a60e73180fc8d0c914f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm on disposable hosting. One prominent URL, 'https://resalured.ru/strik?utm_term=when+pangea+split+into+two+continents', is directly associated with a heuristic firing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution, and the presence of embedded JavaScript supports this.

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://resalured.ru/strik?utm_term=when+pangea+split+into+two+continents PDF link annotation
    • http://bebarupeludif.22web.org/ask._fm_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/vDXr8jh/world_war_2_facts_for_6th_graders.pdfIn PDF document text
    • http://fakts.design/44171352721fb8zy.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/gXhfcif/siguditelisupagilagif.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/LwI9gfZ/fuvuxobasizibafazip.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/IIhcz00/pekikifujal.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/iohgg9H/marcos_specialty_pizza_bowls_nutrition_facts.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/how_to_use_a_colored_pencil2kff9.pdfIn PDF document text
    • http://policyhelpcenter.com/annie_script_freefj55a.pdfIn PDF document text
    • http://whalesqpa.fun/hp_software_setup_utilityqm9uq.pdfIn PDF document text
    • http://electrumwallet.buzz/78947487845ins6q.pdfIn PDF document text
    • http://top-odejda.com/african_coffin_dance_meme_originvnb8e.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/cjcdIgd/pase_elite_gratis_free_fire_agosto_2020.pdfIn PDF document text
    • http://wumakelanatug.22web.org/intel_nuc7i3bnh_datasheet.pdfIn PDF document text
    • http://idealicacolumbia.site/46834796082d2oj4.pdfIn PDF document text
    • http://gdztut.com/ripanudiwuvawupvp56n.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/tuxenipup/43061744519.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/finest_playa_mujeres_by_excellence_group_reviews.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/animal_crossing_wild_world_appearance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/giresimipamevug.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_off00014494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14494 5204 bytes
SHA-256: cd8d15b9add28d05bf06a14463982f1369aff74f3729b831a25eef84aa677397
font_01_sfnt_off00015668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15668 12644 bytes
SHA-256: 02cd6c42a1f93e265e266b61d3332bc0248556301f2e56c894a02749986d06af