Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7b9d4fccabd8fe…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 22:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2554e8c256104518b5590b17a5bd865c SHA-1: 6a256975bfab4a7b89cedf1422456666fb022355 SHA-256: 3b7b9d4fccabd8fe8a1590ddda607732403447e40eecfab23490745f679b4d8b
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://inwebjor.ru/pbw?utm_term=free+download+need+for+speed+most+wanted+for+pc+full+version', appears to be a lure for downloading software, potentially leading to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=free+download+need+for+speed+most+wanted+for+pc+full+version PDF link annotation
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/datepumadopidibej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_602c854db6bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_605b1c41c12c5.pdfIn PDF document text
    • https://miruvoxizoxu.weebly.com/uploads/1/3/5/3/135397032/denawaj_jevapilogixuvun_kiweju_bokataburemeja.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/parijos-xagubu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426260/normal_60b55d85db0c6.pdfIn PDF document text
    • https://pigupapizot.weebly.com/uploads/1/3/4/4/134480908/7738992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_606139d59928b.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/wolig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6025b3666722d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4453729/normal_60b37746863af.pdfIn PDF document text
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/05591d22.pdfIn PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/2446887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fcc8cd950cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_6064c4f79bb5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_603f9737d5c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_601cf91f2877e.pdfIn PDF document text
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/tulivabit_nofoluron_wedosiwiboben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_5fd9676968c9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5408 bytes
SHA-256: 57f78d87e9e9ea48759314d589761f0babeaa9dde1a8a0ddae657094c1eb05ab
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 11048 bytes
SHA-256: a691ac7ea582bf01b6958aa9a71c824e14bf18ecf764df050b28a826732ec8cc