Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffc5da913817da6…

MALICIOUS

PDF

82.2 KB Created: 2021-03-22 09:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfe98c52937f2479213398bd36e42bc2 SHA-1: 1f3576ef168591c7588596a69c2817fe25c7a2f5 SHA-256: bffc5da913817da6582d4b1ee882db24c1ef2c118af4586c1f26fa7979190fe1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrustworthy domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=allison+transmission+fault+code+retrieval
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/5031250.pdf
    • http://magazinrf.xyz/tomapesu5gs0e.pdf
    • https://static.s123-cdn-static.com/uploads/4393020/normal_5fcd62bb22763.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_5fd370815186d.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/5f8c92eeaef4e.pdf
    • http://gsmall.space/cool_ringtones_for_androidefsxq.pdf
    • http://top-odejda.com/barinh0nmj.pdf
    • http://gisisavodure.22web.org/alien_vs_predator_extinction_2_pc.pdf
    • http://zhenskiizhurnal.ru/how_to_build_a_gravel_driveway_roadhctg0.pdf
    • http://agentsoft.space/mofanaburesevodabupuxev7m4bi.pdf
    • http://acgmgroup.ru/bojufuropozepomauttuk.pdf
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/5334488.pdf
    • http://swiss-gear.store/headrest_for_herman_miller_aeron_chair_-_h3_carbon_by_engineered_nowhn3bb.pdf
    • http://love-your-lips.online/date_sheet_du_sol_2019_ba_programmebh8fr.pdf
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fd37b76bc4af.pdf
    • http://detonic-deutschland.website/chemistry_classifying_matter_worksheet_key4odgs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sotatelovutegep.epizy.com/59082986378.pdf
    • http://novosumagib.epizy.com/zavepakenaz.pdf
    • http://mefetapa.rf.gd/94184514632.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_5aa2c3da1efa44f09cf9f107c84f2077.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_4f20e0b953784fdca03879d467ee613e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105fb.bin
21395b1a0e1e38920e6b6c1ead0215a0af28779a928290184e7d5fed00734e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 5216 bytes
font_01_sfnt_off000117a9.bin
c9d6fc455d794d67160a3da00e8b549f9a62c411fa2901ab6b8148426d4e13a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 10480 bytes

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