Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c9ef3b76a5125…

MALICIOUS

PDF

68.2 KB Created: 2021-04-06 09:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 261a50503a532952e80e2220b4654c3c SHA-1: 6b25f1d050b069068475affc1f3b45faaf9f777b SHA-256: da6c9ef3b76a51252a7c94f3d8e00695576b947f4e1c716a799003b4c41337c2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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://fokemale.ru/123?utm_term=htn+guidelines+nice PDF link annotation
    • https://zewugijisisu.weebly.com/uploads/1/3/4/8/134885238/eb2fce.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/fObifGZ/offline_video_app_download_install.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/9055542.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/gafiwa.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/kaxuwof.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/jgkxhhd/fanoxuvusepe.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/metodologia_de_la_investigacion_juridica_gabriel_alvarez.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/RjaajeF/funny_stickers_for_cars_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/jjdPujh/75492635523.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/aletha_solter_carti.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/giAQFDQ/falepukusakakuxisejolud.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/IibQbhj/kigunirerali.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/Nj3vRgi/27479369598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_cd58e61de9f0466eb3296ae7fae589cf.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_cb78daf54f6f47c79fae71d607a94693.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8bc6a68-8f41-4ffd-a869-9d8e985da0c9/33282477067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d761b09-ad09-4310-8da5-1a8b2b6c6d24/doxaliwoliref.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_f8c8c8c494ed4f31b524a0d51bb28251.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_e4d52133816349eb914e5d7941109e29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9219de49-43fa-457b-b7e3-fff5abe1eb23/ganaxofiz.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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 4760 bytes
SHA-256: ee67bdea3daacbf32d55bf00affd2b0385690f66b7e29a2188f987c8c5a0e69c
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10788 bytes
SHA-256: 910e98754bdd2c484609b61f197352bb5813fd0ba57384284e202e8c3faa4a4f