Malicious PDF — malware analysis report

Static analysis result for SHA-256 6100f6ed941b7f45…

MALICIOUS

PDF

80.9 KB Created: 2021-05-19 03:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f6f2610f49a90a94b7e3510f1c4b4367 SHA-1: fca69b7ed601f8992ea7eada9581837931bb2442 SHA-256: 6100f6ed941b7f4586dd23951fa8ac82f40d0e22915fcbbf4a4fbefc32e0c779
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious sites, aligning with spearphishing attachment techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=pacify+horror+game+apkpure PDF link annotation
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/1715402.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/6983a.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/wexobafeg.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/sexiredadubako.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/nogerediduvarif.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/ladusulakilinuveliwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_605bfc9d2d6ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_600610c13a3fd.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/7571643.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/9821040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_60303fc60f982.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/xagimo_jonitokosol.pdfIn PDF document text
    • https://venaresumizom.weebly.com/uploads/1/3/4/4/134468274/monusesan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_603be4dad5e22.pdfIn PDF document text
    • http://zemavavidebades.22web.org/witcher_the_last_wish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_604d99e21201f.pdfIn PDF document text
    • http://fegovoze.22web.org/asrock_h77_pro4_mvp_specs.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/giduvexul-kuwulojemaju.pdfIn PDF document text
    • https://lukadivosegiga.weebly.com/uploads/1/3/4/6/134679105/654fe7bf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapiruligifujo.epizy.com/ntn_bearing_catalogue_free_download.pdfIn PDF document text
    • http://mibawojerasubuw.rf.gd/el_camino_del_artista_julia_cameron.pdfIn PDF document text
    • http://dosevidi.rf.gd/jeffersontown_police_reports.pdfIn PDF document text
    • http://matemot.epizy.com/bid_bond_advance_payment_bond_performance_bond.pdfIn PDF document text
    • http://bulodagobudika.epizy.com/gudaleg.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_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 5388 bytes
SHA-256: 74b0677e34c1d45b3e6737ee41229226db497f4abbd1775dface8c98fbc2e849
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10492 bytes
SHA-256: 233eea7763ed2aeb53af660284f34aa42b1a1617104e03274486609fa370d3e8