Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4912bde5595d9a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-09 03:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dffff267696620fe089cd033e8ed9ec0 SHA-1: ae754449e1a4d1ec1a357d32c100db606f89d0a3 SHA-256: 2d4912bde5595d9a40afddcd6f0da05aa138e092fd1187a870399316654fa7b3
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to exploit users' search for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wb?keyword=abnormal%20child%20psychology%207th%20edition%20eric%20j.%20mash/david%20a.%20wolfe PDF link annotation
    • http://notdull-eng.online/how_do_i_program_my_bmw_2019_garage_door_opener_chamberlaincwcw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_603c0dfdcf777.pdfIn PDF document text
    • http://evatopshop.xyz/limupimuzafopotexexexuvusl0lk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_6010d30294fda.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/mibokeko.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/pijazezemapaxijije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_6016048650fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603176ce36962.pdfIn PDF document text
    • http://ezfix.asia/86978484873bakzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_603e754086a16.pdfIn PDF document text
    • http://fruktovik.com/siwasigegabinumn928.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/332a0afe03896a.pdfIn PDF document text
    • http://italiahot.space/why_are_viking_appliances_so_expensive1ainr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_a7ac6a173f74488298f91f814566d193.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa309fd-fe52-44b6-8087-c1cd61bee277/jiperujunosanes.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/sodapexupisusibewozud.pdfIn PDF document text
    • http://gusutawidike.epizy.com/33924606233.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_0921d6a2b52b410e8c71bf106504ca48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cf405d-0aea-4ec7-8002-12c8ab2f450d/52102285043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eca6cd-0b8e-4376-b7c8-9df7bb471166/jawumajotix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782f2e30-aa56-4a63-96a4-acd78da04dbb/54493870153.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 6176 bytes
SHA-256: 089679ce0d927d38cd7de9e6406eefd659e8555719db74dfb6e71fa9a7985e72
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10940 bytes
SHA-256: 1263d3699ae3b363f2aad4d42bf5356ea6448f98c273cbeb5e44ce1bf09e3c21
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16084 bytes
SHA-256: 3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848