Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8c9ac4193e0577…

MALICIOUS

PDF

117.4 KB Created: 2021-03-13 16:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b94e0a7d4429c1097080d962e3cf96d6 SHA-1: 447534a81b28c4a9fbf7efbaa1605cb3e6921db0 SHA-256: fa8c9ac4193e0577b99cb9eb3875495f0b33de9ba1d974857dab4db50459cf6f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/aws?utm_term=como+se+dice+100+a%25C3%25B1os+de+soledad+en+ingl%25C3%25A9s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6022bb45837aa.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/tIig1am/92629136603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6010ddca1572a.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/good_topics_for_writing_a_report.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/0b5f679773d428.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/lhaDeLb/road_to_valor_world_war_2_wiki.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/fupaxufufuro.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jcvZhcJ/download_run_race_3d_mod_apk_terbaru.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/damuzikoxusidox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_60279c161b024.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/hiiiijb/milikerululex.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/wodoweveb-waziraf.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/raxewufilikox.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/cidjcr5/davifuma.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/jihgh2p/bodusesamisiguzawono.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hQjeC4z/94882491085.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/ciddVji/school_of_dragons_dragon_egg_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_e99c2b195afb40219e6076a541aa0a78.pdf?index=trueIn PDF document text
    • http://vozovowu.rf.gd/55612750486.pdfIn PDF document text
    • http://xafaxeko.epizy.com/sikerifijop.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_ee8e4bd6aa2540fa8348145968c904b2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001754a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754A 5516 bytes
SHA-256: daffb4e8ea07a8cd344524ea40e3398c2b74ef5c938e73c46f9ee15f7c2e7cca
font_01_sfnt_off00018892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18892 5616 bytes
SHA-256: 6b708fb67b8440ca8abaafa4b33504b025f76388f19f4fba661a226d1941e5c8
font_02_sfnt_off00019b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B13 13080 bytes
SHA-256: 4194ee9751959b47802c1cc913661ea12224c1435e3905a69683ad55417ce033