Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddfccbfcfdfc4a8…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 05:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5de2279c2cd89e91357c13f6ea32f5c5 SHA-1: 6a8507db84370e7257ef09778f7e10dc986f5406 SHA-256: 7ddfccbfcfdfc4a8cc5e63ae82dd1a1fcaf84c69f6449af9294a721b310bd611
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=apk+for+computer+games PDF link annotation
    • http://fobexometoparu.iblogger.org/90508223165.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hRu3she/download_heroes_of_order_chaos_mod_apk.pdfIn PDF document text
    • https://kezivujiwot.weebly.com/uploads/1/3/4/3/134329954/sorud-gazebodugaleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_601f9cce01858.pdfIn PDF document text
    • http://nevugol.iblogger.org/pusijuxubosuwinode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_5ff9da0cda1c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/geBibd1/snake_eater_time_paradox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_6007013121ffc.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/weloni.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/3kZDcEX/falojewizedojurigoxal.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/tizonak_kojozetudozilod_momatamiga.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/hVheJji/paypal_apple_gift_card_canada.pdfIn PDF document text
    • http://tujozavido.66ghz.com/what_is_games_in_physical_education.pdfIn PDF document text
    • https://tuzuxomewe.weebly.com/uploads/1/3/4/5/134527180/de6d47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_602ee25f8ce3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5ff90ecf3a742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_f80a7f9bc25c4c9ba0ab50dcc510f358.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_6e472358de394b21abeaaecef2d86436.pdf?index=trueIn PDF document text
    • http://bovubodomumid.epizy.com/ganpati_atharvashirsha_marathi.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_5ee82ff8c8aa47e89489b59a21bbce96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ade307-cab6-43d9-a656-417b4399d9cc/62384755153.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_a4c94c24e1ea4ffcaa2167a19660c9fa.pdf?index=trueIn PDF document text
    • http://saziwujezad.epizy.com/lemivisizokilozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603cc1ce-7c0f-4733-9765-2ea8120c0a54/4970969687.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5356 bytes
SHA-256: 85207f7a1296cae3ac28931a6ecce6e504f3db387a82d77e46f186fa37e933d6
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 11076 bytes
SHA-256: dbb889a81c8f3c799dc1fc517b1c7dfd9253e7fa5a0ad43d05677ab35ff23990