Malicious PDF — malware analysis report

Static analysis result for SHA-256 175997846fce7d99…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 07:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7c4adefb8b9d99d8c521cc9b704660f SHA-1: 05ea8fad41615d6252457e969ad159a3fae7c659 SHA-256: 175997846fce7d991186509a2275729c79d5dc605af58cf40d243409d7a5110c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malware. The presence of numerous external links and the detection as a phishing/trojan variant strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=swann+camera+app+setup PDF link annotation
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/2b2fd2198.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/4401788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_604b344941c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_60037c453d353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5fc7fa9b0e1bc.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/kisiralato.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366331/normal_60b0d419a32fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6052b603b0ebe.pdfIn PDF document text
    • https://birijejukuz.weebly.com/uploads/1/3/5/3/135386669/6789398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_60320970550ba.pdfIn PDF document text
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/958783.pdfIn PDF document text
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/fewadowibuxaxamibow.pdfIn PDF document text
    • https://zavavowufode.weebly.com/uploads/1/3/0/8/130814597/8676981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_60664ae2845aa.pdfIn PDF document text
    • https://sizasaligibi.weebly.com/uploads/1/3/4/5/134506534/f55a5.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/larixivolejeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_606916b4df657.pdfIn PDF document text
    • https://memumijakularaj.weebly.com/uploads/1/3/4/5/134507661/5153486.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/587d185d-761c-4367-8d04-c5dea9a02b1e/vipuniveje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a2271f-9a37-4854-877b-7c36c610a8f2/99443870877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef49a11b-28cd-4c8d-8d6d-c1b3bf66c277/download_attack_on_titan_season_2_end_of_the_world_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124d2431-aa99-4074-a75b-34c90b9cc903/20822902507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ef572b-9dd7-4fa5-9cc3-a039e6a6aab2/what_are_the_suns_rays_made_of.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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 5240 bytes
SHA-256: c5e82c143962e7ecc6fda9391db247f2b3636ae93b391e16c00ca8a55177a7b1
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10876 bytes
SHA-256: 46f051451cf9bba4e7c9bf903d329b71c6d41eca32e8de639171709024502aee