Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cec1b3b737b8c5c…

MALICIOUS

PDF

77.0 KB Created: 2021-05-18 06:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 22925d85e15ab083b89a7f66f8ca0619 SHA-1: 29d834fc1858732864a6301dda01a33be7d24fc5 SHA-256: 0cec1b3b737b8c5c50d60fc4d4c73460617a9c6837240b32defd6846fc71c465
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=bose+soundlink+3+firmware+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380228/normal_60317618b1c16.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/565e4d55.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/pogirilefipeka.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/gulewigosejus.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/guzis_resanow_saguduselufeka_damelolor.pdfIn PDF document text
    • http://buzifun.22web.org/canada_online_visa_application_form_nigeria.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/musujikukede_loxetuxetomusi_vimiwawevuwu.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/2156748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fd974d23b250.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/1661178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_6059e4a5b199a.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/disibanugub_wurer.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/f1566f28-a4ad-4167-9db5-8dd19afa9684/ridepi.pdfIn PDF document text
    • http://sasitegeke.epizy.com/68307925163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4e82c7-e898-4e11-9d85-49fbd1322a3b/62409398957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecd237d-fed6-45ad-90dc-14cfc8156077/22197054074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9786e9-4000-496b-a8ca-d05f2b745ebc/96924482100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3961105a-4b4f-4349-addf-773a77cb4e8f/murray_self_propelled_lawn_mower_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6873d6e0-b3f2-4098-b689-c7e4ce85e514/lewisawurusi.pdfIn PDF document text
    • http://pizubape.rf.gd/festo_pneumatic_valves_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6843ede-4ce6-42ba-b68b-70b72a320601/sufepirixaze.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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 5556 bytes
SHA-256: d549aac4d58e50a4eb786d2961bdbe9bb91ffc498aecf3810c91ab76948ddff7
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 20328 bytes
SHA-256: 2afa180ade582c9ac7324400c9edf5f3960434c23e5566550a91d99a517aaca3