Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc21c4a17fdaaa0…

MALICIOUS

PDF

74.8 KB Created: 2021-04-11 22:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ddaec6a8d7c81bcbdab5348beab8eddc SHA-1: 0362cc912a748ad98d1b3777be1ecf0f791ce2fe SHA-256: cfc21c4a17fdaaa0831c331f463a5b21f8c9c817ad72ce06125973b947edb803
206 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/strik?utm_term=understanding+experian+business+credit+report PDF link annotation
    • http://muxubax.22web.org/advance_ruling_under_gst.pdfIn PDF document text
    • http://wogavuxemadirof.iblogger.org/pdf_editor_delete_pages_online_free.pdfIn PDF document text
    • https://viselejipu.weebly.com/uploads/1/3/4/6/134698272/3332952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_600bc5dfcd277.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/mokapazopisudob.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/dirikasemozup.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/1a6567f940201.pdfIn PDF document text
    • http://zigijel.22web.org/jopabufujabujazebika.pdfIn PDF document text
    • http://nofosofeze.iblogger.org/jamipegaganafujivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_606460548dc4f.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/vixuliximakiz-wagawejunerexew-pasipibeva-junafok.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/d243c615-e75f-49df-b176-712a21b7db08/pharmacotherapy_handbook_10th_edition_download.pdfIn PDF document text
    • http://gesejovefovu.rf.gd/collaborative_problem_solving_worksheet.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_b67ec6a1818744b9ade463ccd3dacb13.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_c88582cbb33348d9ba44f37f696b7013.pdf?index=trueIn PDF document text
    • http://telosizaba.onlinewebshop.net/the_vampire_diaries_complete_series_books.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 5408 bytes
SHA-256: 7a891ee4c9ac215f5e32141ac35127e865ae280e8e3841f7386f6159c0623109
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10824 bytes
SHA-256: 472512b9837564fe92bca84a3537e08979f6767bff585ee1924e1c1dee0d6db1

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