Malicious PDF — malware analysis report

Static analysis result for SHA-256 becc9432d60c3c26…

MALICIOUS

PDF

115.2 KB Created: 2021-04-01 15:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5fda81dc9c788e42b5fde1abb066a49d SHA-1: 7ff0e257e408e8470541a502a4eba16c93ea7eb7 SHA-256: becc9432d60c3c261909a1dd3faed6a73b89c486ff25d5c6e9404dedcafc124b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with a significant number hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a high likelihood of malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/wix?keyword=manual+de+convivencias+wikipedia PDF link annotation
    • http://kodavuviguwu.mypressonline.com/dalupagomipenunijubijof.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/arachide_plante.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/ihhbSjc/morid.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/3jiUidM/xuzipuvewowilemitiguliwa.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/c7f3f4a73.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jhefhbY/kifuwimuxidam.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/gigghYv/95015175242.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/LWjgHlH/lisaguvanukewefutepigu.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/asme_bolt_standards.pdfIn PDF document text
    • http://wagijap.22web.org/walden_and_other_writings_by_henry_david_thoreau.pdfIn PDF document text
    • https://reledizov.weebly.com/uploads/1/3/0/7/130775001/2a789c0f634836a.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/igiajam/top_ten_arabic_songs_of_all_time.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/sitofewatudenez.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/jjigBgc/70634954562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bc1ed1-285f-446f-97c7-4723e98aaa6d/who_is_the_ugliest_kpop_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffbbe65-c092-4a18-807a-2d8b0966e9fc/swann_4k_ultra_hd_camera_review.pdfIn PDF document text
    • http://wefalojinon.rf.gd/compelling_conversations_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3093a3-e945-40ae-b71f-e4845e3660b7/how_do_i_program_my_charter_remote_to_my_cable_box.pdfIn PDF document text
    • http://sazubewotul.rf.gd/13757812228.pdfIn PDF document text
    • http://zexiwovo.epizy.com/various_types_of_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48143ddb-c103-4bd1-b18e-5da9559746e8/how_to_explain_the_balance_sheet.pdfIn PDF document text
    • http://madoduv.epizy.com/communication_skills_for_the_healthcare_professional_answer_key_chapter_1.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17365 5192 bytes
SHA-256: 73e555ac3ca522fe32404d8876ddb72a6c69646b0f7249ba0a4d7461fd363366
font_01_sfnt_off0001853e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853E 5780 bytes
SHA-256: 0f2fb540ba7d6d19966d6599f270cccca8dc3bc30d9981bbb429cad34f91540e
font_02_sfnt_off000193d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D1 13064 bytes
SHA-256: fd85e2bce39b3dc42c409bb8bd577b79052f8053b1429b4a21cf9d79804e91d6