Malicious PDF — malware analysis report

Static analysis result for SHA-256 025c8ddda0baf1d5…

MALICIOUS

PDF

70.2 KB Created: 2021-02-20 18:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 073c1f8561ce7f56ddb9debbbb3bb70e SHA-1: 0eb5dfafe3e962b9dad3ec5e5d5ea0abf5cb24cc SHA-256: 025c8ddda0baf1d56727f6ddad86b0c480782ff0007816ac368fee8c937ee79d
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous URLs, many pointing to disposable hosting or unknown reputations, reinforces the malicious intent, likely to distribute malware or engage in phishing. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=original+joe%2527s+minestrone+soup+recipe PDF link annotation
    • https://cdn.sqhk.co/puvijupem/idgikmX/68376527567.pdfIn PDF document text
    • http://load-bcp.com/66101067198rw0pz.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/8063699.pdfIn PDF document text
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/jebuje.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/gd5jigc/fefekiwasogisure.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/977884.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/fjhjnjg/fopukibibivemenelatolifa.pdfIn PDF document text
    • http://atlas-copco.su/what_are_the_basic_concepts_of_electricitykb4mz.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/rolafufelu.pdfIn PDF document text
    • http://vehicleusains.com/beehive_bedlam_free_gamescopv.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hohgZ1v/26309409772.pdfIn PDF document text
    • http://erethiztzj.space/conditional_probability_formula_3_eventsz41uw.pdfIn PDF document text
    • http://simcars.ru/36332228503rvtru.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/iPuQhhD/phone_guardian_mobile_security_vpn_protection.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/iNIn8JH/zomejeweboxajelitujuzo.pdfIn PDF document text
    • https://xobopigo.weebly.com/uploads/1/3/1/4/131437845/21fde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/rohit_name_ringtone_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/beverly_hills_stars_homes_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/terraform_availability_zone_openstack.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 5392 bytes
SHA-256: 94611e1f3dab7bb48dc139a03eaa27ebe891324f37ada5327b2e3ba39307ba9a
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 11040 bytes
SHA-256: e82abfa0c9a5900707c1328195921eb3f0592b5ab9ff942b197f872735b55805