Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5bff0231ad95e9…

MALICIOUS

PDF

113.9 KB Created: 2020-11-12 19:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ecaf92504caa7c8815d1eb36afe6b5f8 SHA-1: 727bc9bae079a65ecf3f137f0bd149ad2bd58457 SHA-256: 2d5bff0231ad95e97791be599df29bee382d2c31d8458646c4610aa99d654f2f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=11th+standard+english+guide+pdf In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/safunezijowefup-wuluvifolat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fa45acecbcac.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/jevule.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/1597457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f8ff91aa9131.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/fuvolijozogelizalabe.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/rifanad.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/58169528599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d100525-632a-45b8-9781-768ee418eba4/60209208202.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/noclip_roblox_script_arsenal.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/lamarimibonirem.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/sajaxovatamebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf668ae-f181-40ca-88dd-712dc21af566/32384304427.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015462.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15462 19600 bytes
SHA-256: f7fda9ae496e528759a569ddf5ad29b8d24d75cfb8c4d7b1ccdb0121f330ac75
font_00_sfnt_off00014286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 5260 bytes
SHA-256: b1f1a610f50da83719a17176c3af5759c8b8dcd10d5535e36594cababac7687c
font_02_sfnt_off00017ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE8 11948 bytes
SHA-256: 448c7ab1e443ae53801b68cf94e94520f46ff28aaa550eebc4d75494a883d513
font_03_sfnt_off0001a50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A50F 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df

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