Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9bdfb6ce2d3bc…

MALICIOUS

PDF

74.9 KB Created: 2021-04-25 02:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 867123d29f6c69771ad07744d18ebe0f SHA-1: d62bd6c9beeb4ab36d777217ecdf05bb37c12ce6 SHA-256: c1f9bdfb6ce2d3bcbd32ad4c08d957e364a49d358acb016eddd5e1266cf3787a
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a high density of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=pain+scale+for+newborns PDF link annotation
    • http://tekplafond.xyz/vorupemonuwabelittpwst.pdfIn PDF document text
    • https://birifaxita.weebly.com/uploads/1/3/4/7/134718336/jijar.pdfIn PDF document text
    • http://mivamoxejepije.iblogger.org/beregaxilipofudesu.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/fJibidj/racer_vs_cops_multiplayer_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/eljcge4/galactic_core_live_wallpaper_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/aniajj1/assistant_director_jobs_film.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5feed281226b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_604deb1931c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60299ad99161a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5ff529a7d54ba.pdfIn PDF document text
    • http://in-step.shop/nordictrack_c2255_specsjvi8g.pdfIn PDF document text
    • https://zimuroxojirewun.weebly.com/uploads/1/3/1/4/131407818/wubazid.pdfIn PDF document text
    • https://zijixowopuza.weebly.com/uploads/1/3/4/5/134524639/b2d6842a.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/I1jacid/77319927208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokafupu.rf.gd/22831698087.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/lab_report_density_accuracy_and_precision.pdfIn PDF document text
    • http://febarufowit.epizy.com/podofu.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/causes_of_world_war_ii_worksheet_answers.pdfIn PDF document text
    • http://gekikebikujog.rf.gd/dazomexavenunib.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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5108 bytes
SHA-256: 85eed14e1d34f5744d31652194bba51f3cbda0922bc2a4a6417024cd8adf1242
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 11044 bytes
SHA-256: 661aadfc842ca88f1623bedede339cd3ea18cd88417c0e04da62112d176bd375

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