Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f69b12f43ecef0…

MALICIOUS

PDF

81.5 KB Created: 2021-04-08 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da558f6363e659ef7bced56a6ac42332 SHA-1: c8c2dc8d08f2e84e5cfdd54d4ce41c37f2662662 SHA-256: d8f69b12f43ecef0c8139c05fa7a56a0de5cfaa49ca6518266df4297c9bbef7d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted PDFs, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources. The presence of external URIs and the overall structure point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=harry+potter+book+night+competition PDF link annotation
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/7c5ec0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_600f2d1b919c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_600951cab3fac.pdfIn PDF document text
    • https://lolozodosut.weebly.com/uploads/1/3/1/6/131606575/3232558.pdfIn PDF document text
    • https://cdn.sqhk.co/ranilabar/iZBfjjf/51832684497.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwuvojik/gstB8ii/40003625600.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/bKhd3zE/31932202000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_606c3f4dbad50.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/ninivetufojenojur.pdfIn PDF document text
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/jugupemadiwez-xitodipuravejup-wotijijopa-luwujasimefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_602d4c3f6c3db.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/Bjg9hbA/68224739720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fe6db5b1032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_604e69d4d1a63.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/Chhijhh/52185239335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_604819bfa8272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_601851521efee.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/lheoQT6/offline_games_free_download_laptop.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/72065667758.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/hijhXgc/gelodosififimitunagowetuf.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/bexisoja-tujonogoludal.pdfIn PDF document text
    • https://cdn.sqhk.co/sozedikepasu/dSibzie/74977702302.pdfIn PDF document text
    • https://pujeradix.weebly.com/uploads/1/3/2/6/132695809/bekatelali_nukivel_wodibuvuwulapaz_gososuge.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://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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5192 bytes
SHA-256: 32101ef209c9050116bf302eb87aecfcb75d33fbde414103c072452a1e7d8e3d
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 11180 bytes
SHA-256: 13f36f7c17cdab4ae72d2717d264eb9055d7c78353b0fda73ddf05afdff61097
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378