Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c10159911d0ba6…

MALICIOUS

PDF

71.0 KB Created: 2021-03-09 17:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c5b6387bb7993bd7c604061d87ba56d SHA-1: 43b22bad1e190be1eb8cfe76ff60eeee64e63b6c SHA-256: f9c10159911d0ba607664b8d59d1e65a1601fb65caab5033a7fa0c1f1a0338ae
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript, though not fully analyzed, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=coachmen+beyond+pricing PDF link annotation
    • http://vienvozvrat.site/the_making_of_the_english_working_classn27kh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_603cf861cf974.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/bhiLKgc/gabefisewadotud.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/haOgg04/nbc_sports_gold.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/8670495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5fe5938a2e1b6.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/hfujeCJ/32653409076.pdfIn PDF document text
    • http://load-bcp.com/chrome_remote_desktop_for_pcnhp5z.pdfIn PDF document text
    • http://replyua.site/angard_staffing_holiday_form5w501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_60396808917b4.pdfIn PDF document text
    • https://nigusejokolutat.weebly.com/uploads/1/3/4/6/134688827/2795858.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/NgdWoic/edpb_guidelines_on_territorial_scope_of_gdpr.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/9571292.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/ghawheE/advance_auto_parts_augusta_maine_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_39fd7593b70b4b1c9ef6b52ae0414c39.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_aefb6715f9b242f7b017ff9bc26e0283.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_3b9a4ec01ff44cbcabf217627a9ded9f.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_b8c221c78c3e4c8bab440a376296a086.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_03719330228f4843835379bd672ed906.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_21b94467442047ca801f328a7d836345.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_32bfffa50a9b441db148f1afaa993312.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_5a7a9d3f0c354de38c75e9695bf93cac.pdf?index=trueIn 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 5424 bytes
SHA-256: b3d61a1a4c732e6de7fef7e44713fce59e9db15cac1eda82fbe3d8b2a49f3807
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 10336 bytes
SHA-256: 236c7590502f104d682d31202edeba9b7dd8a6f28fbb0f7553b45e1c3bba18d5