Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a281c144dbe5441…

MALICIOUS

PDF

79.0 KB Created: 2021-02-26 04:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 891557540dd63cf296f994cf2ee12030 SHA-1: 7d6bb97544ec045f9af8aaa10afa030a6435a446 SHA-256: 3a281c144dbe5441287ca103b47d1986f5f90c4e6b94edb1760f5ce3a03be60d
184 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 a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The presence of multiple links to disposable hosting and redirectors strongly suggests a phishing or credential harvesting campaign.

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 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.
  • 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://yafferge.ru/strik?utm_term=american+hunter+feeder+test+instructions In PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/88812627133.pdfIn PDF document text
    • http://evakuator-uga.ru/bottomsheet_android_resizedrm7k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418556/normal_5fdf2f345eb9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fe840c8318f5.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hdgjshi/39483906853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5ffd2a50e76ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_6016238996a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_600b427b0c9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/iggeigb/12242146650.pdfIn PDF document text
    • https://cdn.sqhk.co/zosikoto/Mcjeicz/cuballama_tienda_envios.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/64605898956.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/ronatiduzoxij/wekuvuxigamal.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/vitiguboba.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/font_balloonist_sf.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/devafijowatagogadewivag.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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 5220 bytes
SHA-256: 4b838e270012ca3ce2478040ac7fa9c13e99be6a665eff192f18e26fc5bdf568
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 11064 bytes
SHA-256: 66cfbd4cb521365e285a9eeb3e1d8d96c9f42fb37b602d6081aabecb2db4e5d6

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