Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ac02251bae8409…

MALICIOUS

PDF

67.4 KB Created: 2021-02-11 18:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 244e761c0bd919966bc73f72974eb89f SHA-1: 1f9cbb0c5b4ef270782113fc9becc448b0d9dd50 SHA-256: b3ac02251bae8409faaaf3dd9879c4b9c037ff312785ff8bfc3ab0f4eefb39f3
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one pointing to 'bologen.ru', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely intended to manipulate search engine rankings or lead users to malicious sites. ClamAV detection and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=galaxy+tab+pro+12.2+charger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5ff83100c5bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6015e21fdd7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_6006664c49587.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/vumeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5ff7ecdccb4df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5ff761f5b7279.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/androidx_migration_mapping.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_600a3ea5324e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_601ae93041a2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/human_priest_leveling_guide_vanilla.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/chessbase_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/free_truckers_log_book_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/kobemizob.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/donuxuseviduluzolalat.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/bepipepefadikuxutezoto.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_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 5572 bytes
SHA-256: 583d70e7b27100331d7bf97364b51fadc0af4e8c4ebeb5c2b80961120089498c
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10452 bytes
SHA-256: 97e7cd982073cb5ff449c165bb98292bd93c5734b1726cd854b8743dcbf65588

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