Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38a6021251f20e8…

MALICIOUS

PDF

73.6 KB Created: 2021-04-07 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ace770fb40eb6ec596f25acf6249c0cb SHA-1: de43c3f470570e6b83968134e02fd6573fda6e87 SHA-256: b38a6021251f20e8885b0c3c9ae874dc91bbbe9c2f5e177e224b575c620043f9
186 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. 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 0.9999

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://gimoguvi.ru/strik?utm_term=what+to+eat+for+cutting+fat PDF link annotation
    • https://nawigabijaku.weebly.com/uploads/1/3/4/5/134599080/legasa.pdfIn PDF document text
    • https://xuwajaxupix.weebly.com/uploads/1/3/1/4/131407635/fosokeme.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/dugolet.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/kepojulijam-wamurodakuvugu-kukomijixud.pdfIn PDF document text
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/tugegigigofo_xadomon.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/rebovarotawasil-kuvekidawazid-miretobag.pdfIn PDF document text
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/sakobe-falegigotuv-sonefasobanisij.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/3964206.pdfIn PDF document text
    • https://zelejipez.weebly.com/uploads/1/3/4/3/134353750/fobiz_rilef_jopidusanebebar_tujejokezil.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/detileleva-milibol-gezojotanerojob.pdfIn PDF document text
    • https://navenote.weebly.com/uploads/1/3/5/3/135314710/b262fa.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/alimentos_para_la_anemia.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/fadorakum.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/kaniduzuxepuga_xiximama_rodat_zafalazib.pdfIn PDF document text
    • https://kunasituper.weebly.com/uploads/1/3/4/7/134765547/cc8f47bc0c75.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/cetoacidosis_diabetica_pediatria_tratamiento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipatanakuke.onlinewebshop.net/cellules_sanguines.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 4948 bytes
SHA-256: 225bd3642d50265b59936b664afb1a8b293647122c60cc5e3d5fc24c90e7307e
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10624 bytes
SHA-256: 2449c8fa11aa239722fc31e3831f095e931a9faeba5835587e53efae16924e05

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