Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89812204030794b…

MALICIOUS

PDF

89.7 KB Created: 2021-05-01 02:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bfdfb526b8c90fb271d3cd620a6b3ce SHA-1: 9d13c2999a3d2ce288ac3963f13b901b5ea18db6 SHA-256: a89812204030794b6f01155aaf9f7eaae70158f902284c6434bd58e1493397a2
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one specifically identified as a potential phishing or SEO spam lure. The presence of numerous links suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=vineland+iii+adaptive+behavior+scales
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/kefirizigalokuxu.pdf
    • http://xepuxupipe.mywebcommunity.org/gonuranolinubunivoramu.pdf
    • http://woodbonus.net/does_o2_or_co2_have_stronger_intermolecular_forceswzl5m.pdf
    • http://roflan.site/how_to_reset_lg_washer_le_code6i4ef.pdf
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/aedc519c.pdf
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/1367938.pdf
    • http://kosamaritaj.getenjoyment.net/apc_be550g_ups.pdf
    • http://kimugifogetami.medianewsonline.com/35714815764.pdf
    • http://ridunculus.com/ds212_oscilloscope_manualc3nob.pdf
    • http://chisto-chisto52.ru/visifepawu.pdf
    • http://get3creditscores.info/puvuleroys1a.pdf
    • http://clubstore.info/82518542176a07cd.pdf
    • http://lumogodasekepi.mypressonline.com/46568038309.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://betijeduw.getenjoyment.net/fokokawulazelunesewil.pdf
    • http://qqkaxes.xyz/657300121329rpfu.pdf
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/5730078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_f1c962a4d769459a976eaa9f3f5a6e6e.pdf?index=true
    • http://girofili.myartsonline.com/dixudu.pdf
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_ad01a55bf9da4de88ecf33ca94733bff.pdf?index=true
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_c6e0c58040da4cbab50e9a813a9014f0.pdf?index=true
    • http://lawesiwewif.onlinewebshop.net/laboratory_safety_precautions.pdf
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_f477a149b6054ea5b196812100843f03.pdf?index=true
    • 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_off00011def.bin
8d89308c1cfcf6eb2bdb67c6037b254855c6565b6a6d1ba299c31660dcf5bf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 5328 bytes
font_01_sfnt_off00013005.bin
29d70f28db62eb5c1d3b75770804b6fb934772deb6dbd5bf5be6a0ce8f911427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 12176 bytes

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