Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc727070327fba1b…

MALICIOUS

PDF

76.4 KB Created: 2021-01-09 16:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6318222d14238440d07f679478066219 SHA-1: 70b88aa3acb86d0abb9f98120b763f759c437c7c SHA-256: dc727070327fba1bddd0021e6ebbd95244e9a215cc5e899c948ed48159c11b07
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming scheme. It contains numerous external links, with one prominent link pointing to 'traffset.ru', suggesting a traffic generation or redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a mass of external PDF links, likely designed to appear as legitimate content while serving a malicious purpose.

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
  • 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://traffset.ru/aws?utm_term=handloom+bedsheets+india PDF link annotation
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/91868a1d.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/aggjji5/fafikikado.pdfIn PDF document text
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/wokolefovikat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fe44c5bb3a63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fcf0b8f4d5ca.pdfIn PDF document text
    • https://suvuzijovibalis.weebly.com/uploads/1/3/4/6/134660606/8a57f64fed864c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fekazudabo/algebra_1_book_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/tableau_tutorial_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/20982270581.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/calendario_copa_mx_clausura_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/49808389032.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
font_00_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 4856 bytes
SHA-256: 564806b97f1c47dc28e0cd252f00fe7d37851ece029fc380b2545aada6842db3
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10728 bytes
SHA-256: 557f43654b58de353ae3939c00be660bb460fb973c41014a1165c3b0a5a94ba6
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
font_03_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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