Malicious PDF — malware analysis report

Static analysis result for SHA-256 4149589e35a719e2…

MALICIOUS

PDF

106.1 KB Created: 2021-03-03 08:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a9590ecaa055a3a7a6904e7a2e8a9cb3 SHA-1: 201ccfe811934307b78205b25d6a1071829cadd9 SHA-256: 4149589e35a719e26d0f5718cbc06680bdefedc2f52f1a465720355a3f68b8b6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. ClamAV and ML classifiers also flagged this document as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the link farm heuristic strongly indicate a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/award?keyword=mihaly+csikszentmihalyi+flow+theory PDF link annotation
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/tojesapolevej_zukowolojevugon_zuzanorudakit.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/ryobi_1800w_210mm_sliding_mitre_saw_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/foBgdGk/yeet_cannon_meme.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/jokatogizis.pdfIn PDF document text
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/tutuwawizabig-zikibebakit-gasusimizaveb-medalutom.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/85ifZge/ditomulogavolekisutut.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/vujorupupiguvorad.pdfIn PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/xufepodigu-fizavusajobas.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/wibefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasakekom.epizy.com/tesimina.pdfIn PDF document text
    • http://xuzexotunel.epizy.com/51888427784.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/31372210760.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/wuvegivapi.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/93686364852.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/68807266750.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_off00016432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16432 5436 bytes
SHA-256: 6a1224c59acf372a614232db7c94fd8895d1d6b43631ab09b9021cc208e31098
font_01_sfnt_off000176b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B2 10748 bytes
SHA-256: ae2c568f0e9d2d06bddcec6af140b2a70543d5ff2eb7700d19c34c892ffef57c

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