Malicious PDF — malware analysis report

Static analysis result for SHA-256 924952a6a25de98c…

MALICIOUS

PDF

79.9 KB Created: 2021-02-25 14:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 14586d8954f51c53170489540cf33e06 SHA-1: 706a5a4028ff1a3e6f59ec7223309b3c5836945e SHA-256: 924952a6a25de98ce373553e122574b0327e4eee9a63466afaee12da7dbb607d
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The numerous embedded URLs, many pointing to disposable domains or redirectors, strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=the+one+kiera+cass+page+count In PDF document text
    • https://cdn.sqhk.co/mizogujuzo/pYiaphd/supreme_duelist_stickman_pc_online.pdfIn PDF document text
    • http://creditactive.info/how_to_cure_brain_fog_after_covid7ha6b.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jhilPha/pocket_craft_survival_mode.pdfIn PDF document text
    • http://dajinanumiki.iblogger.org/3513194708.pdfIn PDF document text
    • http://discout.online/messenger_apps_fbae109.pdfIn PDF document text
    • http://verification-help.com/samsung_ak59_manualkw20r.pdfIn PDF document text
    • http://my-favshoph.online/35673924935ct93l.pdfIn PDF document text
    • http://mrshadow.net/simple_business_plan_example_for_coffee_shopc1ycx.pdfIn PDF document text
    • http://invitesistem.ru/vexitawajitukidivi789z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/46730865224.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/wimolexaxatinamured.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/kingsley_academy_ofsted_report.pdfIn PDF document text
    • http://fasosurid.epizy.com/bootstrap_slider_free_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/88085034095.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/91609987048.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/sexuwobepujosakutoletip.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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 5176 bytes
SHA-256: 5f9e5c9b0f8c4ee50dbf924c85221cc3024e1e8a0a0ec4fd2b32940c8a7d7033
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10240 bytes
SHA-256: 55b3232a295bc4bf9afa25e8a9d9860eeae80593758b83f43d5aedb6babd4a4d

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