Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5b1c569c7165e…

MALICIOUS

PDF

72.7 KB Created: 2021-01-09 05:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7986c3775eba65fbf8d22f019e2ffbbc SHA-1: 1fe9b282f322b125e63f0f1e80dc3c64e0f7b52b SHA-256: 4fd5b1c569c7165ef40168b97e9b047b7e948d23efe1ed82453c5a3e70d9515c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

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://trafffi.ru/wb?keyword=science%20vie%20photo PDF link annotation
    • https://cdn.sqhk.co/jivapereb/hjJija7/detilivojoged.pdfIn PDF document text
    • https://lezivefa.weebly.com/uploads/1/3/4/4/134458465/jiwolik.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/PdjfjeU/vililojewibiwumaze.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/wjgVT55/wolujazuvunerinini.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/gSjd4id/naxopijisadugagof.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/xewewasimabapap.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ejg3geh/degaximu.pdfIn PDF document text
    • https://vidapinuluselas.weebly.com/uploads/1/3/4/8/134865598/c449e92b.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/vukujidor/15763699430.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/bdo_alchemy_money_making_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/ganaginu.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/jitofama.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/126963220.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/48876442776.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/48628104421.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/sewebelojisabirebux.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/pajuxilokebolopuxo.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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 4668 bytes
SHA-256: e53e7b8761fe98376b0b96ed11c9ba1670511d865a78ef1c85b4c3d9da4021da
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 11992 bytes
SHA-256: 8e2414d125a58ee361d23405f031318e082bb8679acd3a335c8a59b3ec075bfa

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