Malicious PDF — malware analysis report

Static analysis result for SHA-256 2722944781a71a73…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 19:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5e89f1251b6971f9b37e8c3f5e997aef SHA-1: db73576d6a6a3441770639ae3265878195235c27 SHA-256: 2722944781a71a730d2acebb81c04bac296f3b2d6db8557116434f52d1cbc1ed
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=grid+and+cloud+computing+lab+manual+2013+regulation+pdf In PDF document text
    • https://wojozumokibenap.weebly.com/uploads/1/3/4/0/134097994/2117850.pdfIn PDF document text
    • https://vazigawexike.weebly.com/uploads/1/3/1/6/131606690/e6f0bc44185315.pdfIn PDF document text
    • https://pogugabumivo.weebly.com/uploads/1/3/1/3/131381840/bosibesikubezi_bazebaxijuroni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5fd72f4d625bb.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/7531925.pdfIn PDF document text
    • http://sumaralomemev.iblogger.org/59846219883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60209a57ac171.pdfIn PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/zanesajaxam.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/bu_jhansi_private_form_2018-_19.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/6a8ed7b02c8.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/vikixim_fusojuxuriw_guluwufaj.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/1648701.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/sedisiwogeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_6021cd25b6c3c.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/6945927.pdfIn PDF document text
    • http://xidakuxekon.22web.org/44199876538.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/bc5cea0c3.pdfIn PDF document text
    • https://domirirezup.weebly.com/uploads/1/3/5/3/135382932/semirofejuzu_luxadixepen_luximuxatexaput_rofewofexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figupowogo.rf.gd/80753026221.pdfIn PDF document text
    • http://wumekupewug.rf.gd/anti_malware_free_for_windows_10.pdfIn PDF document text
    • http://xituduriximujat.epizy.com/spoken_english_course_for_beginners.pdfIn PDF document text
    • http://gujavez.rf.gd/legipotidafimikumexobat.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5960 bytes
SHA-256: 8b36001bf890514d196ba1da5adcaffb3fd6cc3f35c8a596843a7ce9c8950dad
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 11040 bytes
SHA-256: ed178cec3c6c76936378bdf1806765813d15abe6aed4b8d66ff4dbc651233feb