Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b67d4db6a033468…

MALICIOUS

PDF

69.1 KB Created: 2020-11-13 03:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 71873e6a114b2f00ccffa4d60d67769b SHA-1: d6dad18dfec5faa7f857ac80643a4f9e64e567eb SHA-256: 3b67d4db6a033468363f84400bbeb4f6e66764f2a36d7caa04bd52129c66fedb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier also indicate maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely for phishing or malware distribution.

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://gettraff.ru/strik?utm_term=ginzberg+mesleki+geli%25C5%259Fim+kuram%25C4%25B1 In PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2186812.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://s3.amazonaws.com/loxopudizus/9779585595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b75f1f-7c8e-4fbf-afe5-fde189ad2895/bevusigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0e699d-4495-42b2-8cad-a0cb6a2c1214/prism_weight_loss_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/zimedikezizox.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/appareil_urinaire.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/biological_anthropology_concepts_and_connections_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/axiomatic_system.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/zedodoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d04c588-ff45-4f7a-9bb4-5aac41ccc7c3/gobitomanijanekaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/64035599559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484feeb8-ecdd-429e-bd02-41ae870e349e/87682729493.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_off0000c3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D3 5264 bytes
SHA-256: d96c517d43502c18e57895c9b63fe7b3cbfb42730c8c628fe24bc2854d96c91b
font_01_sfnt_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 10740 bytes
SHA-256: 27de519c9b3b0aa65524380e2d9d2270f388213c176f2facb9a301f8efcecc24
font_02_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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