Malicious PDF — malware analysis report

Static analysis result for SHA-256 08921a1727aa86aa…

MALICIOUS

PDF

74.0 KB Created: 2020-12-18 06:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 93d2ca150f4563db99894b28040bae53 SHA-1: 33e4c1ad3b8fc61a225891069f7abba37be0ad8d SHA-256: 08921a1727aa86aab0af17c85dac35e63f71b27324b19d635e683fc2de7c0ec5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains numerous embedded links designed to redirect users to malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary redirector URL is 'https://gettraff.ru/strik?utm_term=mobdro+premium+1.2.214+apk', suggesting a lure related to software downloads. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=mobdro+premium+1.2.214+apk In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/4e0d994f.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/zosijonarokeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5faa498b59ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f9399873be0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8e05bd91e68.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/3060514.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/pugumanelave_rabidejirajuv.pdfIn PDF document text
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/nisolajidajena-raxorabebukaka.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/9267276.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/712152be-6fd2-4c04-a43a-28ba281fa668/givaxukosozogidewarul.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/complaint_letter_email_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8407331a-88a3-4766-9543-e261817467ab/ipod_shuffle_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5c223f-b0b4-45c2-9e6a-e3c48dc206a2/midwest_grow_kits_spawn_bag_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 5408 bytes
SHA-256: 748be4f27858ee57740fd042f1fd07d6e33f25a5cacae2988caac35587be6992
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10476 bytes
SHA-256: 23ce6f8ab4f5d8049eec8e10f6d33fa82a3db9a1be6cbe34087aa2d353f8672f
font_02_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 17876 bytes
SHA-256: 918cf1bd3467b2b2ec2943eee929f5cd14a046294b75415f0a64c4bb49716384

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