Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f5d7e8baca7991…

MALICIOUS

PDF

81.0 KB Created: 2021-04-17 03:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87ec7774735694606834024e9300ac9b SHA-1: ae7ba018c4ec4da7b6d4490783a44f187e67d4db SHA-256: f2f5d7e8baca7991dc170290b65366f3377fe2c07272672f0d9347b92ea98262
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=ryobi+battery+charger+specs PDF link annotation
    • http://storezone.info/mokoluzim12i0y.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/haOfPic/project_management_methodologies_waterfall.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5fd712e9acfdc.pdfIn PDF document text
    • http://hookup157.site/distributive_property_powerpointkhe2r.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/kEgchgm/gibbets-_bow_masters_rescue_from_the_hangman_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_60588a8e8593a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fd67c2d3db54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_b70e3dd5aa044a89b9d1ab25c58b7c44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/328fa0cc-1bc7-4539-b6ab-1ffd6db0dee9/california_well_standards_74-90.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58673f69-9e1b-40e0-83b5-f0b782ac53de/jeep_grand_cherokee_wk2_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035ee396-745b-48e7-b70e-7faf75704fc3/fluke_435_ii_power_analyzer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d063396-8d5c-4e89-a78d-543c51d4d8bc/neutral_tone_poem_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde5e532-8c72-4de8-8aec-3c8185230275/86492828669.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_5ef884fa562f4e7bbfff457eb8589538.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2058a403-7ca6-4092-afd8-265ed0ec7ad1/does_southwest_rapid_rewards_have_travel_insurance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6901fc57-d372-46c7-bf8d-2c8df92bef3d/442374516.pdfIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_071acbd2032147998a8005caa6f70a90.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_11a0bdc9c2c144e783e9034c80149d6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53fe69f-d0ce-4c3d-bd49-c28c58fae790/nawebifomapevatirunaxo.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_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 5412 bytes
SHA-256: 59d2ff121196ff2585d3d450a5573575d442860cec7dd5af76ee983e40827b5a
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10384 bytes
SHA-256: c974d8a444a9142dd01cf6e85250465eb85746a537d4b97aef66a745a7fb6256