Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0665f20afff7adc…

MALICIOUS

PDF

87.9 KB Created: 2021-02-16 08:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ba2840290db3b15037205ddccafbbf7 SHA-1: af0317c11ee88594bc0f79450ba8f8d31cb80d3b SHA-256: a0665f20afff7adcbbf99ddb75753004e4a1a343d7f8dfba4710f182288e9e36
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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 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://bologen.ru/123?utm_term=ged+practice+test+illinois PDF link annotation
    • http://study-english-02.space/al_green_sweet_song_lyricsb2afj.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/94b9a144d54782.pdfIn PDF document text
    • https://cdn.sqhk.co/jawakagufu/Yigkoie/suvesozulubinulowunuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_6028fafc871ec.pdfIn PDF document text
    • http://espaceabone.com/190990046532wygi.pdfIn PDF document text
    • http://bobr.space/plague_doctor_kid_memengno7.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/KidXIs8/stickman_project_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/jgGghu2/avakin_life_3d_virtual_world_mod.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/sujabanoge_jifiwofazekoz.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/gjthiFz/6653722631.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/Iifvegj/starz_series_hightown.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/gf2wnhb/wogarisazapixirivip.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/fjjPlic/mosakuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_600fe005dd9b9.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/ick4xRd/zokiruzuxijulepabopiposo.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://bozetuv.rf.gd/42610676300.pdfIn PDF document text
    • http://wajutomagavugaz.epizy.com/55271412797.pdfIn PDF document text
    • http://robabunegulawi.rf.gd/canadian_visa_application_form_outside_canada.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/cisco_anyconnect_mac_high_sierra.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_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 4884 bytes
SHA-256: a772c025d88e6b1f82fa007b7b061d6693fa734b33ee1a5d1950665e711cf16f
font_01_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 12444 bytes
SHA-256: a925599763ff8253a78afa8d97a5175ce5a8ba397c1db922611502fe8ce1f7ab
font_02_sfnt_off000142fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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