Malicious PDF — malware analysis report

Static analysis result for SHA-256 924fabc90f9e74a5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 18:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0b4d33d0c38fea02f94606c9f76d2c1d SHA-1: 5d2641f309bb141d6628cb67e4267b493726d97e SHA-256: 924fabc90f9e74a5d79e8bc495cfe99d82cd3b27dad55eee0e4d3f0cd2f949d2
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 0.9991

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://golowaki.ru/wix?keyword=battle+monkeys+ios+download PDF link annotation
    • http://gadosamu.iblogger.org/problem_based_learning_in_nursing_education.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/zibutivujufiwovizulo.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/g7wjhZ2/discuss_branches_of_philosophy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_602ed72ace760.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/tokutexebirag-pewavumunotus-gipafa-wakonutu.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/7d3e2ad88d.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/jgGPnjd/75124803378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_603ba7e48e520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_605463941bbe1.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/mujepij_wagipajokereziv_waratidukazas_zavubob.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/zirasumudijux.pdfIn PDF document text
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/tigovejudewikuf_fawofi.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/756677b.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jioqx5d/85529871664.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/8659830.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/ghjs1pG/bike_hd_wallpapers_for_desktop_free_download.pdfIn PDF document text
    • https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/nulatofogotuloj.pdfIn PDF document text
    • https://zoperugojoboriv.weebly.com/uploads/1/3/1/3/131379643/a122b.pdfIn PDF document text
    • https://pozukelemiku.weebly.com/uploads/1/3/2/6/132682282/9a5593a6f795e0.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/fce27013e1.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/FTibhfE/gst_status_check_by_gst_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rebobimakefeli.epizy.com/berilevolanok.pdfIn PDF document text
    • http://zuronixo.rf.gd/z_transform_properties_table.pdfIn PDF document text
    • http://fefadipif.rf.gd/sazatamepelik.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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5184 bytes
SHA-256: 8035ef124c0eedff9aa0e6f207ca80b32027a9f833352e490f9e4f473263c6ac
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10760 bytes
SHA-256: 9ef39695fbf153a44b6212e38362d7aa04e2a0eb69fdf792cceb999ad6c4b46e