Malicious PDF — malware analysis report

Static analysis result for SHA-256 99451cb9ddd58ac0…

MALICIOUS

PDF

76.6 KB Created: 2021-01-18 10:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 36d06f205f9eb6721d81e252d806c19c SHA-1: fa2cd0eb02050b38f827f02c04894304298761cd SHA-256: 99451cb9ddd58ac068ea968624b21c2ec35eff898c3432382c0f744b6d3bbb82
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download further payloads or redirect to phishing sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users through deceptive links.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=what+is+an+example+of+a+process+measure PDF link annotation
    • https://cdn.sqhk.co/fexejikexew/jBifouN/noxojir.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/lavuru.pdfIn PDF document text
    • https://site-1167928.mozfiles.com/files/1167928/chocolate_cake_recipe_with_dark_muscovado_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/agcig8C/woxixifigeb.pdfIn PDF document text
    • https://site-1254116.mozfiles.com/files/1254116/cash_flow_budget_forecast_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/iWhcIeS/2.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/1f9d2f27384.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/iiryEPL/i_wish_you_were_here_love_quotes.pdfIn PDF document text
    • https://site-1178774.mozfiles.com/files/1178774/cumulative_frequency_step_polygon_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/jiLB3jh/snapchat_filters_for_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/rilabotib/YZDiaid/stickman_archer_4_apk.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/gimopiwutuvejifejaramew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gadoxijumulop.epizy.com/xulunawegefuloravimajevi.pdfIn PDF document text
    • http://labireninofut.epizy.com/60155262910.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/catholic_answers_consecration_of_russia.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/93316602708.pdfIn PDF document text
    • http://koxowasone.epizy.com/sword_art_online_integral_factor_item_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/93613269906.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 5216 bytes
SHA-256: 2a478f65bc34ce6b79fd413793a008f4a65e363b1c92f20f2ebdcb68dc6b96e3
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 11968 bytes
SHA-256: 189a4fa5fea5f541c302c8618bd3289a3c27d71ca6a9b076ee2a5541db6f492b
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3