Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69f6aa1ca5bc98f…

MALICIOUS

PDF

113.2 KB Created: 2021-02-23 16:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5725065e6c0ffe7a07eadbaf619eefbe SHA-1: 890e710a8ae3b301cef442a86ef0dcf74fa2a925 SHA-256: a69f6aa1ca5bc98f316717bf4b24f1e7c4c93d83e490fcad9bc591e06bbdd9b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a large number of external links, suggesting a link farm or phishing operation. The embedded URLs point to various domains, likely serving as lures or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=army+pt+walk+standards
    • http://mini-cam-v2.club/
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/lodubabike.pdf
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/db1a994.pdf
    • https://paruralevefux.weebly.com/uploads/1/3/0/7/130775474/4976564.pdf
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/jiwado.pdf
    • http://kemytbok.xyz/global_handwashing_day_2018_narrative_report0xypu.pdf
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/528c1afcf.pdf
    • http://trend-sales.fun/29976670300yb06x.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_6023cd7baa8f6.pdf
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/ce0715522.pdf
    • http://kvrovk.xyz/wall_street_journal_subscription_deals_studentz3raj.pdf
    • https://tewawizibix.weebly.com/uploads/1/3/5/3/135347661/3934291.pdf
    • http://musofiron.ru/972303850033lsjf.pdf
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602c58a1297f5.pdf
    • https://cdn-cms.f-static.net/uploads/4453335/normal_5fd87a7c9faf2.pdf
    • http://dimax.website/mekivarirugarodimiwiwuladybtdz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181ab.bin
87fede932b3c177798b1db96634ee739e0ecb177da7986b457c68e1ebb776598
pdf-font-stream PDF embedded font (sfnt) at offset 0x181AB 5352 bytes
font_01_sfnt_off000193dc.bin
e3c49d68c2f12fef65fda47fdf26cfe1e976af9edb97f1de52884811c36c6f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x193DC 10580 bytes