Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb985399a23edd4…

MALICIOUS

PDF

72.2 KB Created: 2021-04-02 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 07ca5a61449727d1dcf76b2ea8477999 SHA-1: 7a5ca44a8b5ab11d5b0f5c3f89216aa23540a361 SHA-256: ddb985399a23edd47a3a3318658c96499bd086142edecaa784c396b2e4669ec6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=fender+mustang+floor+multi-effects+pedal+manual PDF link annotation
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/fupix-nugirasen-fikiwuzet-fepixej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff7bed78a558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc60c4ad7ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_60239a4532bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5ff0e872f232a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_601dc39527209.pdfIn PDF document text
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/58877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_6046d1ff0fa99.pdfIn PDF document text
    • http://wunowixumofe.22web.org/i_am_angry_quotes_in_hindi.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/2241172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_600f13f80a701.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/4fa600e36.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/zapufafix-tezirogenoniv-nasaf-jovifijoruli.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/ef29d9a0-a6cf-47d8-8adf-3114a024959d/1000_bright_white_led_string_christmas_lights.pdfIn PDF document text
    • http://susesibukof.epizy.com/bulma_css_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422ff3c1-fddf-4f0f-9d24-55bd78bbd16d/9919321984.pdfIn PDF document text
    • http://wizasagi.rf.gd/50761556044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2c0691-d290-4ee4-bd01-92a180270950/rodixudevuretet.pdfIn PDF document text
    • http://bafopivazizaxon.rf.gd/annamayya_telugu_audio_songs_ing.pdfIn PDF document text
    • http://fadepuluweg.rf.gd/hp_photosmart_7525_fax_instructions.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 5460 bytes
SHA-256: e23c6e3f94cb5fa07def8c6eed39998494f59480543376771c5a8946f36e0b2d
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10996 bytes
SHA-256: a22e62f9aa575a1b5043b53ca26e2f723504423c2468863669487dc60cb3422c

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