Malicious PDF — malware analysis report

Static analysis result for SHA-256 b145ba6a6e1207ae…

MALICIOUS

PDF

74.7 KB Created: 2021-02-17 07:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4e71b0c023cfa6c13cf8b2f7e6802cb SHA-1: 56cd6453029168bf3ea9fdde8d0dd4983135bdf4 SHA-256: b145ba6a6e1207aee58e038b6d5e233210d5e316994d42cefa0b8c6e6e89fac7
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm. A critical heuristic identified brand-impersonation credential phishing, specifically targeting Apple, and pointed to a redirector URL. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users into clicking malicious links, likely leading to credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/c835bd.pdf.
  • 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://leonvi.ru/wix?keyword=kinich+ahau+interesting+facts PDF link annotation
    • http://kieverts.xyz/maparutujaxuvopejusixa6z3s3.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/TuT0tgc/dog_grooming_long-_haired_dachshund.pdfIn PDF document text
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/c835bd.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/Qgfgjhd/ice_age_hunter_evolution_mod_apk.pdfIn PDF document text
    • http://reznitskygallery.com/spotify_online_erw0w4m.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/1625129.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/5jehjay/xogobunulidamojozasunu.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/zV6hcii/dj_sounds_effects_free.pdfIn PDF document text
    • http://bujupete.iblogger.org/1730802006.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/hco5Phg/chinese_checkers_2_player_rules.pdfIn PDF document text
    • http://agreevudb.rest/xesizerasajasaziziokz.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/ajbm2ic/nilotikaverinex.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/FoRgdFC/electric_guitar_chords_for_beginners_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/hcPgdjb/67668207007.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/9f7302b5e69828.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hgDjgPV/glass_tower_world.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudakesiburegig.rf.gd/plural_nouns_pronunciation_worksheet.pdfIn PDF document text
    • http://muzafevabuma.rf.gd/apex_legends_stuck_at_8._62.pdfIn PDF document text
    • http://donirodep.epizy.com/graph_reciprocal_functions_worksheet.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5080 bytes
SHA-256: 2841dc173608c291f28e606e113ec8216fe014840d486c450f1a04dc4e524cf0
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 10160 bytes
SHA-256: 6f6c6d1125fe372674b8e9f13e531440b761f68a0d5c1f2a08e7ff6d686e397b