Malicious PDF — malware analysis report

Static analysis result for SHA-256 441a76e7899fae16…

MALICIOUS

PDF

82.6 KB Created: 2021-04-20 03:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6944c4f91a262663957b0b4f5ec2479c SHA-1: 914d5ed25c190087c770902653d036a6d3781c8f SHA-256: 441a76e7899fae16d983ca09634f6d97c391a8240d668ace87bf2520956979ac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'ponafet.ru', suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting, a common tactic for phishing or malware distribution.

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
  • 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://ponafet.ru/strik?utm_term=sub+zero+undercounter+ice+maker+problems PDF link annotation
    • http://marketes.pro/asp.net_interview_questions_and_answers_for_5_years_experience9o9hd.pdfIn PDF document text
    • http://meetporte.xyz/6568979827lq0hw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_600e2515c8271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_60567f0d8385d.pdfIn PDF document text
    • http://bnatural.space/driver_booster_keys8abhs.pdfIn PDF document text
    • http://futup.ru/distributed_and_cloud_computing_kai_hwangikeky.pdfIn PDF document text
    • http://edevletorg.com/nj_garden_state_parkway_south_traffic_reportye2jd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_604dc8eec4f26.pdfIn PDF document text
    • http://mynasert.online/64791079076eaou0.pdfIn PDF document text
    • http://kutometez.iblogger.org/epidemiologi_anemia_megaloblastik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6018cb01405b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_600b72bc2d234.pdfIn PDF document text
    • http://jirafka.space/gidabugejatejovulig2heg7.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/2216ffa3-c133-42a8-a917-ff26f6b238b1/defefeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f88feb-efeb-4b84-a632-11c18b09f13c/mikadozijaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/359b3fc3-f251-4986-89c1-d72c007e79ca/nidumabelivexuj.pdfIn PDF document text
    • http://fawaxadil.epizy.com/applied_economics_k_12_book.pdfIn PDF document text
    • http://vefafovapekaxa.epizy.com/skf_needle_bearing_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d9f956-e0ac-430a-82fd-9b4f3cabc6d2/momovosut.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_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 5576 bytes
SHA-256: 3fc5135d09f9ac769ea6fa83eddcfe44c2e883a1749291479d981a5caeecbe92
font_01_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 11060 bytes
SHA-256: 15522a7edc7e1e2c5ced52f146c805640e61e3a9364a4a05d1204cf5cd528fb0

Open this report in the interactive analyzer, or submit your own file for analysis.