Malicious PDF — malware analysis report

Static analysis result for SHA-256 1730af6d8b13c75f…

MALICIOUS

PDF

90.1 KB Created: 2021-03-30 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 297ecf77e577529d445a40ff7486d493 SHA-1: 0eccf61781166ca6c576391e9d2250500b861563 SHA-256: 1730af6d8b13c75ff299803085986e1605d54d4a2cd0ba2385cdcccbbf5f29a0
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=assaulting+an+emergency+worker+sentencing+guidelines PDF link annotation
    • http://vijevejumozugim.sportsontheweb.net/vupajokiwijo.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/miracle_9_hair_products_reviews.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/winemigogofemilemulim.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/agricultural_marketing_research.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fc8939a97174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_6000d053db87d.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/british_council_ielts_grammar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f435a7b3-953d-444a-94d7-5642161c7a8a/rivufudixutifun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0afacb3-7e8b-4c74-9b19-0bad889bb779/21602452410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61d3d0-ee2b-4d0f-a752-9aa0b0ac9e51/what_is_service_economy_supply_chain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c21531-2733-49a3-9ae5-cab6dff551ab/dell_1320c_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/best_alliance_leveling_guide_classic.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_0a8a7c7436a24ca0afbf579582be67c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/500e5439-6224-43e4-b1b1-88119ff08713/dojoxulotesugivuramelu.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/stephen_hawking_movie_benedict_cumberbatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd61cac0-d893-45a5-8f9a-ce2a0ad89f51/how_to_turn_service_engine_soon_light_off.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/wajepiwadijoxivitobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ac6335-324f-48c1-9b7b-29fd77945dc0/91122701254.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/circles_angle_relationships_worksheet_answers.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_4e950980a2194aee94a64d2b6957b835.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9456b2ae-b5d7-4be6-a17c-3db696fbc97f/how_come_my_snowblower_wont_start.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_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 5504 bytes
SHA-256: 0532ca4029fb3144c0428a49115a3919e637104910bf816ecd0d9ca98137c1ed
font_01_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 10852 bytes
SHA-256: daa3960e1ee5c9737f7aa51342a3f303fac63ca6e59ba46ad9eda7769214df2f