Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bfb6ee492391d3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 12:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cb945552f3d5d26d013a04ae9e290293 SHA-1: c2ce52521efd00631a22c126871ed7490e9044ad SHA-256: 79bfb6ee492391d34276e2a710d72cb1f8e3dca0b719112f3bc2329de52804d9
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a critical ClamAV detection and ML classifier flagging suggests malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=leavitt+high+school+athletics PDF link annotation
    • http://bewizasosu.sportsontheweb.net/sasefenapis.pdfIn PDF document text
    • https://putevafim.weebly.com/uploads/1/3/4/8/134881436/nujubigo_lotiw_giravoxu_kilufezamip.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/wiwujutapoxuf_mapinesu.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/31182152668.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://uploads.strikinglycdn.com/files/9cf7e93c-22d6-4862-bba0-98f399645944/is_there_going_to_be_a_warrior_cats_movie_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e287eb6f-41df-4d31-8389-95864488ee7f/craftsman_planer_blades_3_5_8.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_4f824325c1784df2b58fc27d7ec9494b.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_3b3ca55677274afea330683d7a781cfe.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_19669ad750254a3880d3f02aabb88107.pdf?index=trueIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_afaa6a32cca34218abc55cc86b34c444.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75633206-6273-4bd1-9809-17f61cf94564/fisher_and_paykel_dishwasher_error_codes_e5.pdfIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_4fe63e5c460c4711a03be499ada8dd09.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_f6c393d8a79047ce900027ae6d71df53.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_9b525fd859b64ffeb3e91a9042030c6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e334a2-1205-4b66-8342-b6c9864f4d6f/dantes_inferno_painting_botticelli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f4e0af-6d46-4c8c-9a0a-ee51745b0dde/more_scary_stories_to_tell_in_the_dark_book_free.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 4648 bytes
SHA-256: edfae56f7ee8e759df5cec036aac2936d83c53503c599d774d90916b04b0302e
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 11272 bytes
SHA-256: 2973f7bb505fe1aed5dd5b12d089eec7c408822dd1370790627f70d084877d22
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230