Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9e016a07a83af…

MALICIOUS

PDF

74.8 KB Created: 2021-06-09 18:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f36f86fcc739ef6ec7921877843d99ef SHA-1: fcad5a44b030f7be42b42ad56ddae438a4ca1798 SHA-256: a1f9e016a07a83afc6aa92e1c685db9c923b0020f53a66d2fcbb8b615e0ff726
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://queure.ru/pbw?utm_term=clash+magic+s1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382420/normal_604d9a3b9f46d.pdfIn PDF document text
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/lemek-nomidafa-kowajokidosum.pdfIn PDF document text
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/kofofe.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/6097679.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/kavelonitijutirexiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_60bdc34a86ac0.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/598d87db.pdfIn PDF document text
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/0642efe9cb79b.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/9963506.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/dafuvuwadejajimena.pdfIn PDF document text
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/loxanefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6037a27ff0a4c.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/8270278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_6041824522b2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6f609b4e-b76e-4be5-ba15-3ee71e65319b/bahamas_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27e97b7-539f-4a58-b658-0123c1e8da8d/votiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282efb91-7a71-44aa-bf9d-d7687ef81889/how_to_paint_car_body.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3671a6-3eac-4c82-a100-fd66c8acb6e0/66189940985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a683df21-2007-43c4-918e-b54920e7cc37/tidinoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85cbedc-16d8-4842-b94b-746d2e04739a/58094213866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9a74a5-cc09-471f-8998-d3d19ef3e764/40354916866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87432854-da9b-44b8-a74f-87d505f45462/is_element_a_smart_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 4568 bytes
SHA-256: 19a46abff7b52b19d5670650872054b3bd6141eb252de28b8e10320211659fb2
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 10728 bytes
SHA-256: d984f0e2b08b7d7547f65d5766ff5cb937c655434139bb0677b3c47dfb3fcd81
font_02_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361