Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766ac8979bad3a0…

MALICIOUS

PDF

67.0 KB Created: 2020-11-21 11:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f69ff464ba27719a4ec11417b746ce9d SHA-1: ed96864a5d9310e12568360d13632524ba274bd8 SHA-256: d766ac8979bad3a0f9eb2e5aadf86305e2a5f63e381e997e06dcfb7e44b1755f
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The PDF structure suggests it's designed to act as a link farm, potentially for phishing or distributing further malicious content.

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://traffmen.ru/123?utm_term=patrol+meeting+planning+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_5fb72f86c160c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fb458ac12acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f9395374c405.pdfIn PDF document text
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/kepop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f90eabeaa397.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/1872497.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/siribovotuj_zapigekavovig_niludesevifodu.pdfIn PDF document text
    • https://ferirakiwuku.weebly.com/uploads/1/3/4/8/134899479/nebofejemidenaxunan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5fac239408ddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f91f3b349fdb.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/zetare/cameroonian_dishes_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e175e317-2544-48b4-b4ed-144035fb12e0/hello_kitty_friends_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44823362-77b5-4571-aefe-d43e3ae3ab6c/rujetofe.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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 5236 bytes
SHA-256: 0e9726a4097ca04ef67aa84ac3ef72fa377d260591378bb6566e8c2be755b7b4
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 10468 bytes
SHA-256: af4cee42a90b5af76e363a75d0665b0fc63259a201ce69c338320039aa0d9e42

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