Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db98251230d67ef…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 19:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a54167c4116b2a40da08f60a80052c2b SHA-1: c336f0f1378bc7a462670eb405195dc43d0acb6b SHA-256: 8db98251230d67efdef33f25014d3a58fbec32490202e3931e90ce2cbc9ad949
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a lure or distribution point for other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://midufefew.ru/123?utm_term=rules+of+attraction+imdb PDF link annotation
    • http://balegetiwep.mywebcommunity.org/tukonujanezikuferorefun.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/ajMgpgi/50419949620.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/6853239.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/juzirugofepiku_xozavaw.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/lexebodabudod.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/fafokalul.pdfIn PDF document text
    • https://rejoxaratexudo.weebly.com/uploads/1/3/1/4/131453252/kiwixoj.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/9821697.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/d3adaa7aea1a.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/number_theory_course_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/ggRehag/daxifasab.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/gdgj6jf/street_of_rage_4_switch_boite.pdfIn PDF document text
    • https://cdn.sqhk.co/demapibo/cgeZVny/how_to_play_stephen_sharer_rocket_slide.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/4dcc21b.pdfIn PDF document text
    • http://digovin.getenjoyment.net/93249324915.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://pogukazew.rf.gd/app_musica_gratis_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/fha_property_inspection_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/xujugukaz.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/labikiwenibunamoguxu.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/cast_away_2000_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/free_music_player.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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5196 bytes
SHA-256: 9bdff948e77ef853426cef7a1fe0e287700f4f5d21b35cc7a817daa366b2d25f
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 11152 bytes
SHA-256: 3859df608fabbcbdbd6e0694f0084c6a4e279d135fb33a712838b795eb34994d
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333