Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0df8a78c042665…

MALICIOUS

PDF

79.2 KB Created: 2021-04-08 06:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f9101ff4ff0e1f91562825d7702bd74b SHA-1: 3e5321c11e31c588a2a78bbbf1a3f6cf9591f0d5 SHA-256: df0df8a78c0426657b6e10088535bf9da099d5f72d2d6020af9e2744cc601493
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially garbled, contains text related to a Garmin watch, likely a pretext to drive users to the malicious URL.

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://mezovuduw.ru/strik?utm_term=garmin+approach+s60+watch+won%2527t+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6012ce471f7af.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/eZ4hfhi/quizup_multiplayer_in_counter.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/zhdxDDk/majorumakuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_6015f04bbe195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_604de0cca7303.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/giarifD/vepidovivisoxixolapezav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fe9230896b9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_6009ab9a3fde3.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/4226ac82-8927-4809-8011-bd48240f256c/riluvobevedeleko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98282aa-7aa5-4c97-bbad-b9900e3a29f9/54739813563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1a7f28-a4bd-4f3e-bd7e-445bd8f9d5f5/wishful_drinking_lyrics_casey_donahew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd78f2d7-3d01-4844-9cd3-e7f80ec61dbf/fazelade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69539429-6f4c-4273-8671-ae4db07c606f/what_is_the_us_longest_war.pdfIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_14d2deac4a1149cc90f1ab5a957b41a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/743b3038-dd48-4b4b-b3a7-8f8db2cfe4d2/how_long_does_international_mail_take_uk.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_1296378cc0ab491fbf01cb4c3624626a.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_91af06e62cbf4ada83a81a242a9a97df.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_5387fe29951d454dbf3f18c1f5172d5d.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c3836e5cc1284ae7821a9fd932d17113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b14b81-f7c5-4f43-81c0-ed3a9c5a120f/60191495043.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_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 5592 bytes
SHA-256: 2bb9e23e6a5d404281e9d587befbc847bef91a4084b5d7441398c6a7e44e20ab
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 11204 bytes
SHA-256: 74037153a7ea2bba01eab0b4ca9d7bb0eb3857b40a15b5fb42f45d23bd8aecac