Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e83d08702fa62e2…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 17:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54145b6dd709a2f4f126c9fcf85334d SHA-1: 7e2d89fdab7fe3203ffa95e228baea86b7fdfb8f SHA-256: 8e83d08702fa62e23b434f8d82a1ccb63e2fd1c0b7b5f686272e0025e51f95f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on dynamic DNS services or file-sharing platforms, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for executing malicious actions, such as redirecting users to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=how+to+install+tp-link+tl-wn722n
    • https://cdn.sqhk.co/tipusuzog/SieIqje/first_birthday_party_cake_ideas.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/lebimijajejinugaba.pdf
    • https://cdn.sqhk.co/wujukipako/mgdb5n2/zanoboxor.pdf
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/nafewa.pdf
    • https://cdn.sqhk.co/sawibevas/J4jagio/juvenes.pdf
    • http://takovod.66ghz.com/11920271476.pdf
    • https://cdn.sqhk.co/wobimore/gLeRPha/turub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://turebaso.epizy.com/memekajizuzudoluwanos.pdf
    • http://gokujipavelidaz.rf.gd/bedifokezanizufomikadubuj.pdf
    • https://s3.amazonaws.com/jojitagifuva/4950712587.pdf
    • http://sudurima.rf.gd/la_mulana_2_hint_based_guide.pdf
    • http://vudazirukileri.epizy.com/political_ponerology_review.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35f.bin
28279f7653b0382996e8a4f4fedd454f7afce12fdd1285451dcffcba3857587e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 5076 bytes
font_01_sfnt_off0000f4d4.bin
72a3fe65f0a21df30f240897224061cfa351088b80a4eb601fb5defb198ec993
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 2268 bytes
font_02_sfnt_off0000fee6.bin
7edeb55f053828d577ed06aa086fc9e40fc7e42a4e507e97e2bb7ab24d66e035
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 12928 bytes