Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbfcb18c78685bb…

MALICIOUS

PDF

67.9 KB Created: 2021-01-03 15:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 741b383d709f99c040d0994a2bf7fb50 SHA-1: ade0f938b2c21ed5d2218f0c57a5b36e05edc774 SHA-256: 4bbfcb18c78685bbe2bedf82e182d792831084a869f8d87ec0dee01f24ad316a
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or SEO spam lure. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document's structure and embedded links suggest an attempt to drive traffic to external sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/wb?keyword=metal%20boya%20sprey In PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fc64816cb8a6.pdfIn PDF document text
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/4066092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5f95480abbac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fae5843d6d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5f9d14eabad1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5f9ac320c6383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5f9945956e582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_5fd7c796e6c87.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/mMGijg0/fexakejipafodesepeto.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/Djgijd5/rarest_pokemon_cards_per_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fb4f4a911de0.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/06916d29-64d9-4ae4-b5fa-4b3bd384287b/heure_las_vegas.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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 5060 bytes
SHA-256: 1a7d9456d8be7862d22eefaa7e5bbc20f0a280200f70e777e6be4f7c10dde53c
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 11172 bytes
SHA-256: b2b2c0b965b2957a765b295f0e9e565f0a459fd9cb685fc6352d86f107b2d359

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