Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa244f6eedb8b0…

MALICIOUS

PDF

80.4 KB Created: 2020-12-22 13:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4a7aa6f1e924500c9b8028b81b927ad3 SHA-1: ba81b7a79120d2985ef6e2d35885dffa9b0d0978 SHA-256: 4efa244f6eedb8b0bd1ffcd77b2eecb18c818886e21972dad8f9f011c350b89f
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URL points to a known malicious redirector, which is likely used to funnel victims to phishing sites or download further malware. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute more malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=wreck+this+journal+pdf+download In PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/44c2cb3f42bb12.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/5832748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fb868ce171ac.pdfIn PDF document text
    • https://sivifarikajuleg.weebly.com/uploads/1/3/4/4/134487261/tatirefakonawa-rijogesatinigo.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/tusalif_laxoge_zusuzipunegiji_vuvejam.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/cee32d60-cfc2-452d-8e60-c56093124625/sukasedafipumamanojumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfe7740-fb26-46db-a9a7-46908527c992/zatoditekoneliwasuzefixad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d4fd07-0fec-477f-8518-e638c1ae6788/25594060743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd208997-bfcf-4259-ae2d-e6d55641ed97/pewavijujoriwijilof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e9e1d8-10ce-42f2-aa8d-0072f7d0e222/what_is_bby_in_star_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55ebdcf-5050-4ed9-9bd2-040ee6359bdf/93003704779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca42f958-bef6-4802-8543-f7033cebafb4/maritime_tropical_characteristics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2f326c-ce39-4215-8078-345867eb9c0b/7300388267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f592ff0-c93a-4ed0-ba88-b7f4bfd1b720/pusulizori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777c4de1-07d6-40ad-98a1-067aa33f1b50/pilas_y_colas_en_java.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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 5488 bytes
SHA-256: cf76b185e09f42630c907ab390289f1bda57b2420650b2a1270d9eb4bc2a339c
font_01_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 11544 bytes
SHA-256: d48ed315675ffa319d2cba86bbad47577d55fee93b94d59d7107a8b9377b6eed

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