Malicious PDF — malware analysis report

Static analysis result for SHA-256 f775a14da5002365…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 07:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48f6cd75381293c33fb5eed96aa1d90c SHA-1: 57d2566627f2dee22e33c0eea6ac9f04b0b92a75 SHA-256: f775a14da500236567a62461409919cc32f00e42ba0e632641ef349f147aa5c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 7

  • 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 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://dafemum.ru/award?keyword=atmosphere+definition+geography+pdf PDF link annotation
    • http://jigapenufi.medianewsonline.com/79443165713.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/88639843679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ffb806b01301.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/iiHjgZg/one_good_turn_deserves_another_meaning_origin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fe7879b6de72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fd787d7dc880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fdcf628da89c.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/1gehaeo/best_power_bank_for_mobile_phones_uk.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/faroruluvakopulujafogas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_601883ecaa100.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/d3cab1aa-defe-4d66-95bf-2e30976f9812/93241897743.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_0ec0f26af0594dba895ed8d09cc5b7ac.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_7fa5ab47b3f3458bb19fb449e566eb56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d91416-2773-48ef-a270-c21e1bc89e1b/74036204517.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_98dbca4282eb40a28840893991f25f55.pdf?index=trueIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/xegepedudi.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e643dcd910964c67b1ac678bc056acbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a003759a-530f-4d7d-962e-a447ddde891c/2013_toyota_corolla_radio_wiring_diagram.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/38280577133.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_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 5516 bytes
SHA-256: b330b9ff08bb2fd77be0efcf2a987e4ee96ebde28e6117072a806de34d4a2ac1
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 11076 bytes
SHA-256: 44d48a386594b9b8663d1681a728e6d7429403b85380c8c73b207e6fc6bc3446