Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d44bc9c6bee99…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 00:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f3afccb52d18b78410bda224e64790c SHA-1: b555d6e9d64062ed52737c79848a4e385e12da5b SHA-256: af1d44bc9c6bee99583f47462fdd2b47fc49768abff0330a9f9d630a318d0686
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One prominent URL, 'https://dugedepap.ru/strik?utm_term=maytag+bravos+dryer+parts+near+me', is directly associated with a malicious ML classification and ClamAV detection. The document body, though heavily obfuscated, appears to contain keywords related to dryer parts, suggesting a lure for users searching for such items. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests the PDF may be used to execute malicious code or redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=maytag+bravos+dryer+parts+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5fc83d98d935b.pdfIn PDF document text
    • http://keluzizizeroki.getenjoyment.net/bteb_result_2020_8th_semester.pdfIn PDF document text
    • http://liketsven.xyz/68357723419tfawd.pdfIn PDF document text
    • http://small-italy.space/53865767889u8c9a.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/24457098491.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/algebraic_geometry_a_first_course_harris.pdfIn PDF document text
    • http://palawawez.mypressonline.com/99165191497.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/lezimoje.pdfIn PDF document text
    • http://jopkapopka.online/17199986544at6ke.pdfIn PDF document text
    • http://itwomen.space/91435583269nngta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5ff7fef5bf9e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fca9227dde3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fcba3f9b62d8.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/murray_riding_lawn_mower_oil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_b51b2eb8d589425fa2d92f779f36757a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d4897-a57e-4310-ac85-4c62b4034f9c/what_makes_a_great_dad_quotes.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/bobby_bones_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf1dc3e-6f5f-4b88-8a93-0ddd8ad58fcf/descargar_libro_perdn_de_chiquis_rivera_gratis.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_2ebcdb6360744c9fb2aa5959d6fefcb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a67456-55e8-44a1-9d81-df88b136d46f/mafaxudiwi.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_9d42442fd0504544965c96022aa27aa3.pdf?index=trueIn PDF document text
    • http://teropisarazo.myartsonline.com/2003_jeep_liberty_electrical_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a8fb3c-445b-4d26-9ca1-dddd0903bbd0/what_is_the_power_of_media_and_information_to_affect_change.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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 5556 bytes
SHA-256: b82e46a1d7031742e63da613d26ed7429117f771dfb366e01807aec07807b234
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 10804 bytes
SHA-256: 92367fa6d7db5bda691c4dac6568b3c52b040cef9f288cf2a13b02a9e2c4a11a