Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4ceae483fea54b…

MALICIOUS

PDF

90.9 KB Created: 2021-04-15 18:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 802558dc01c684bd82c5fba0fbf4b74a SHA-1: e6e210a59bef691c5769549789acf2306c6d1f0f SHA-256: ff4ceae483fea54b81c03670dc99486e5ca72e50a4e3090cd6df4b5f567aba97
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of numerous external URIs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://baarspo.ru/strik?utm_term=python+setuptools+github PDF link annotation
    • https://narokijobuwixe.weebly.com/uploads/1/3/4/7/134738868/87b4901995505.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/how_to_repair_the_heating_element_on_a_dryer.pdfIn PDF document text
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/rurizigirik.pdfIn PDF document text
    • http://zanartcc.net/adventureland_hours_tomorrowzk6cu.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/accident_proneness_theory.pdfIn PDF document text
    • http://ujjjrrrrr.space/mavejekeperadasesovoi8uc1.pdfIn PDF document text
    • http://callup.today/wijubelagitoviderelibaru7pkh6.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/85495863779.pdfIn PDF document text
    • https://bunadijora.weebly.com/uploads/1/3/4/4/134432215/2125847.pdfIn PDF document text
    • http://all-gopro.com/52234803444lq7pf.pdfIn PDF document text
    • http://gavojutopubiri.getenjoyment.net/oxford_learning_english_book.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/retirement_planning_in_malaysia.pdfIn PDF document text
    • http://peuer.xyz/962400241719nsfv.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/buvawonuxupojafuziga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca520bb-e182-4453-aba4-5d6e58af4c47/why_do_smoke_alarms_go_off_when_power_goes_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec858209-de23-481d-a8e5-884ada8b4aea/nazm_hikmet_umut_iiri_szleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2a7d46-aff6-4680-ac08-254fc1cd026c/15531618192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327d7c6c-48a0-492a-a0e2-2aa3c38d7210/should_you_capitalize_father_in-law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8642c4f3-e24a-4366-94c6-b8bbabb7b301/how_to_clean_a_crane_ultrasonic_cool_mist_humidifier.pdfIn PDF document text
    • http://kexomun.myartsonline.com/oxford_english_to_spanish_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e39fef-27dc-454c-ae31-3e9acd3c3ab7/jim_inhofe_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307ce14b-6084-4873-8cbc-eb9b3e4f20ce/give_me_liberty_chapter_15_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef908c73-235b-4b90-ab85-b86dabd64663/olevia_tv_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94067c8c-b698-4444-9a81-1b101116c6f0/jamam.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 5016 bytes
SHA-256: 78d0670877b0a8c932d2327b4dd9c9dce11bcb3765b504412cc478f2ea10343b
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 12240 bytes
SHA-256: b975785c927ce3f3df454bc0a51e661285cc68efb2ea1b81ef8aec471bcff723
font_02_sfnt_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36
font_03_sfnt_off000155fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FE 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df