Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbca7dcbf978c91…

MALICIOUS

PDF

85.5 KB Created: 2020-12-17 19:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85fc4741712505a3016b995ebf26905c SHA-1: 1ce15478dfa7e87162c5e78f9d18e600aec0a78a SHA-256: ebbca7dcbf978c9121b8f4d84e5a44530722b42f2cb0f7fca2560e7f150fa1eb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffset.ru/aws?utm_term=nanostation+loco+m5+user+guide
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/pupudexun.pdf
    • https://zopugazuf.weebly.com/uploads/1/3/4/6/134658021/1829877.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/kovopewinemip.pdf
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5f9e0005a7122.pdf
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/763a11d121.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5fa7c5ed38a8c.pdf
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/da72d.pdf
    • https://pilorixo.weebly.com/uploads/1/3/4/6/134689004/vafiruwogekovas.pdf
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/zotigojirigolog.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/5379f9a06057.pdf
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/naliparupifuritixoba.pdf
    • https://mugekezozo.weebly.com/uploads/1/3/1/6/131636766/1374312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e258129-5526-4f86-a211-3704de2d1a8f/fablehaven_grip_of_the_shadow_plague.pdf
    • https://s3.amazonaws.com/zedudo/xesobuveso.pdf
    • https://s3.amazonaws.com/xanebavifamopez/arati_sangrah.pdf
    • https://static1.squarespace.com/static/5fc5cbbe104edf1d77a2c1c8/t/5fd6bc0c034a586a4f51d48c/1607908365590/free_computer_network_diagram_template_powerpoint.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_off00010b6b.bin
0fa169e30ec7c4c882a6e4c2369ad6fff27465e2d7d96fda5f632c8ea3397633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5352 bytes
font_01_sfnt_off00011d8a.bin
f7f0dba1e34eb9ab1f254d183fb3fe72d2bcfee05121c28cda9188671d1d8c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 14008 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.