Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c525a5429c335f…

MALICIOUS

PDF

98.0 KB Created: 2020-11-10 07:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f0517bc24ea2f60c61d4f792de56c05d SHA-1: 96e39c3d5c3a710e8523617bc3adbc9cf7b5c33f SHA-256: b5c525a5429c335f459fb70407349ba990254095d2fc92bd7c016e1681d16590
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 0.9997

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://traffking.ru/123?keyword=occurrence+definition+math PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5f98231163f38.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/34afaef03952.pdfIn PDF document text
    • https://ribufesoguvas.weebly.com/uploads/1/3/4/6/134680119/670a09.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/556baca57cdb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fa0ea3c8677a.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/jasapusuwejatu.pdfIn PDF document text
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/seroxalixipowomafuki.pdfIn PDF document text
    • https://dudixojazimonam.weebly.com/uploads/1/3/4/6/134638097/fofizuwumorav_wupopag_renusopixoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f8c4dc019b22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/pokemon_x_and_y_download_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/technical_drawing_book_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 5076 bytes
SHA-256: 547e4dfab3d4ebcaeac81e7739aee14208a997fe4fbfb257d7834e9a4abd5ea9
font_01_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 13672 bytes
SHA-256: 6a5f9ea2d7ac3816c6ebda11fe6550fbafbff4da93539bf3ee7f48759e43dc5b
font_02_sfnt_off00016310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16310 16752 bytes
SHA-256: a129d144a97728a690a1834ca256e52ae5b56278778380bdb5732b0505f36274