Malicious PDF — malware analysis report

Static analysis result for SHA-256 210f1d0aea6bcc30…

MALICIOUS

PDF

61.9 KB Created: 2020-11-20 17:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb06669dd88c6363955c98806142b39 SHA-1: d19c6923654bea845232951a976946c67e078470 SHA-256: 210f1d0aea6bcc30294d976d0a07efdb7d6cc3df16a7f28756531e8611fe1e5c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=simple+logarithmic+equations+worksheets
    • https://ponikinofenad.weebly.com/uploads/1/3/4/6/134602628/biruleluseluwaf.pdf
    • https://tonulolini.weebly.com/uploads/1/3/4/3/134341491/verir.pdf
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/voxoguvuwurazat_delusededa.pdf
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/rewozuz.pdf
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fb4aec3f0aa7.pdf
    • https://danevetiwa.weebly.com/uploads/1/3/4/6/134600357/334074.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/78837abf1e77576.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotijejaj/gegakageronafimepuzeka.pdf
    • https://s3.amazonaws.com/xisakazelelinim/tusojemaxuvigobolikeno.pdf
    • https://s3.amazonaws.com/sazixipame/20142111081.pdf
    • https://s3.amazonaws.com/jebokizez/mimewogewawupozubiw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34e.bin
694d88472ecd3ab191e13c0b96db9917f1ee340d04e3aa6201083e704817535c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 5732 bytes
font_01_sfnt_off0000c6ae.bin
3ce15e4c659898d168d0082b4e323c38a63f6dfb1ea045d5c54bb2249fd3f70a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 10596 bytes