Malicious PDF — malware analysis report

Static analysis result for SHA-256 6610e9a3c09fa5dc…

MALICIOUS

PDF

72.8 KB Created: 2021-03-11 01:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 622b9a7ccf54c1444ad6739622dae91b SHA-1: 7eba0f76cb723abd86b5ad98f5370f9bd9e3cc3c SHA-256: 6610e9a3c09fa5dc6521f55986f92a79b980a81e6bf76b5258d8770bb13773a7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic suggest the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/123?utm_term=banana+boat+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478430/normal_60177266bbafe.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/YlheicI/79089603884.pdfIn PDF document text
    • http://wofosuj.iblogger.org/98423806923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_6043623f17611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_6025517e79fe8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe3945b74080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3228808274.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/tamil_movies_free_full_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/kosozezoxuxe/ibAgfNH/69219353013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fdda00931a4f.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jeN7BrJ/34132240470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_6038d3923dfe0.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/b8iegin/4730851190.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/jjijNLG/last_hope_sniper_zombie_war_hack_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_600e60e69d293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakolot.epizy.com/45382893441.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_7b4cd9622c314fd1a95cf2b50cf9ab84.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_3c5717c043cf46dcbc4388a3abd62c3d.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_361d4a8df1544726bad4a8a0cee85211.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_4879d6d0cea548f494bf8e260d779130.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_369f335128f94982bdc17aefcd9203cb.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_66109b08b89040c6a84a0261cfcde8bb.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_629983d5cc9d4cca9f1c70e6112d6fca.pdf?index=trueIn 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 4916 bytes
SHA-256: 610cb827ec5b70121584d0ee3aeb97f2a8f4fc5b5fdced96c3b13b47ae4d8d88
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10564 bytes
SHA-256: c97ddd868100e67b17c6f4057f03a3f660a307b71631ae32868d5427a5e1491e