Malicious PDF — malware analysis report

Static analysis result for SHA-256 309a1dff138d9da5…

MALICIOUS

PDF

83.7 KB Created: 2021-03-15 01:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e0b429c829f0e21d5b341f4cbfdeae2 SHA-1: 15bf4a6851ad4dd4c4dee414ead1d99d694d9b77 SHA-256: 309a1dff138d9da5a18c0dc71fe26ef6bff8a88adefb53a367c90101e39d0158
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to product searches, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=best+portable+am%252Ffm+radio+with+cd+player
    • https://cdn.sqhk.co/navozaxezini/Zcji8ia/35189922273.pdf
    • https://static.s123-cdn-static.com/uploads/4460233/normal_6008a9c66aa04.pdf
    • https://cdn.sqhk.co/pekobenew/cOVsgqT/93384621467.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fdf9b359bb86.pdf
    • http://ndfnasg.xyz/256735067408cgxw.pdf
    • https://cdn.sqhk.co/xevowuto/hjNhejd/83379167919.pdf
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fcaa726b852a.pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_603b4bc0a1390.pdf
    • http://klossheff.xyz/trng_by_hay_chng_bybxzia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vaxebisapesi/the_master_book_of_candle_burning_free_download.pdf
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_47e311bce19943439933942525777668.pdf?index=true
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_38b739a188284631b1369cecfa2cc728.pdf?index=true
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_05b6ec9ba0cd4252b93d4ac65ce22667.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_ef52fffcddd447ce8cf327c045100289.pdf?index=true
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_eda130fc04a4485dbb625480e7f84992.pdf?index=true
    • https://s3.amazonaws.com/jivagajamav/porexavexulimugatewamovix.pdf
    • https://s3.amazonaws.com/jukoxisojow/cost_analysis_report_in_excel.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_731802a0dc1e4214a82aeba84d8781f7.pdf?index=true
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_2fa67ed98f3d474e86d53ead1232df37.pdf?index=true
    • https://s3.amazonaws.com/tufitijinexu/bulorimusoximebiw.pdf
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_a62dd609137b4073ba1dd6e4321fc0bf.pdf?index=true
    • https://s3.amazonaws.com/kasuwevovog/jimonazopugi.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_6d026b614a824158aee05f3dabae3597.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_off00010806.bin
6a4f3617858cfcec5156a536ff24e53858ae544733fcece2a1f2635839f9820b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 5816 bytes
font_01_sfnt_off00011bc2.bin
ca5de1c350b2b6e640aa71f729abbb5ee6a3707350e8b503e7d7fb1b7f355876
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 11164 bytes