Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2298b878cfe5254…

MALICIOUS

PDF

80.3 KB Created: 2021-03-28 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 27ec5bfae406532927e5c633aef0035b SHA-1: 74b6650c5c6dfaa75c9e21e8ab9d1e377085bb3e SHA-256: f2298b878cfe525420bff32e61d9688221b5287d6e37b13d1f42da9f65c46b5e
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/123?utm_term=infectious+disease+society+of+america+sinusitis+guidelines PDF link annotation
    • http://organicnu.info/garmin_reactor_40_installation_manualcv86c.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/rudotoduguto.pdfIn PDF document text
    • http://goodsfor.life/popevonametapeug4v.pdfIn PDF document text
    • http://swast-group.website/13153165687whkfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_605a5d40dbd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fdb7d62f0b27.pdfIn PDF document text
    • http://usesalon.xyz/comcast_dvr_not_recordingdszq3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6041caaf5d1c7.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/62187994.pdfIn PDF document text
    • http://raisinshq.club/the_time_travelers_wife_summary29rx3.pdfIn PDF document text
    • http://crawlmqyu.space/pathfinder_monster_cr_calculatorzdpct.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/zedilegol/79952641806.pdfIn PDF document text
    • http://takefaluzimun.rf.gd/26287664659.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/all_cube_numbers_up_to_500.pdfIn PDF document text
    • http://nimozan.epizy.com/ap_grama_sachivalayam_jobs_notification.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_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 5380 bytes
SHA-256: 93c1ee6d73f5826dd6497d9ccc48d50197f3d9d6428ed6c5ab9f612dd2b7e5b9
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 10912 bytes
SHA-256: 5cd409b3d5a77216f085cbc80f8b8355043b2564c55f2e6b174218acf0752d0a