Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa71186e100d48c0…

MALICIOUS

PDF

74.0 KB Created: 2021-03-24 02:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 02471e06b93db8c9b329ca933d8a2093 SHA-1: 26bac4604b70863c787a19818313b818e9a12da1 SHA-256: aa71186e100d48c035efd76527b3beb067ec75100986c9db31763bf483b311e8
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm or phishing attempt. One of the extracted URLs, https://xajibur.ru/strik?utm_term=uniden+dect+6.0, is flagged as unknown reputation and is likely the primary malicious destination. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://xajibur.ru/strik?utm_term=uniden+dect+6.0 PDF link annotation
    • http://jasazotinalol.mygamesonline.org/deenbandhu_biogas_plant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_6041b685e39cb.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/fokemizalolugeki.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/moxibakada-melejik-vidotad-jezagavoluzujuw.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/inteligencia_creativa_alfonso_lopez_quintas.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/boy_scout_rank_advancement_tracking_spreadsheet.pdfIn PDF document text
    • http://businessoutsourcing.info/rosapivelext8x6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fca662abd8b4.pdfIn PDF document text
    • http://wspring.space/lobanuxepujevesejeletilurmjnb.pdfIn PDF document text
    • http://salestore.pro/26692187929sm6yg.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/1e75ff9e.pdfIn PDF document text
    • http://circus.market/bobip0xk59.pdfIn PDF document text
    • https://xefitopabez.weebly.com/uploads/1/3/4/8/134865339/10917b4292cde.pdfIn PDF document text
    • http://lasiwefomibew.sportsontheweb.net/zikitunavugebutulukifados.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/zizodosopiw.pdfIn PDF document text
    • https://sonenekuz.weebly.com/uploads/1/3/5/3/135302947/sulopomosi-lamexopijoros.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/c16d24c6-32c1-45fd-8471-e706f9ebba12/how_to_start_work_in_sketchup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624963e7-30b8-4caf-be77-b00eec2c5282/osha_required_aerial_lift_training.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/7044926114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfc8482-22f3-4914-bb4f-ee9fcb97f009/step_3_score_report_trick.pdfIn PDF document text
    • http://dojorunubi.myartsonline.com/ana_catalina_emmerich_antiguo_testamento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172f9576-7b8e-4b66-96a0-d6d161c46e8a/monuboponezelezelew.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/79058686275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28477c8a-f1d3-4880-baf2-5d3a0eb11cc3/histria_do_brasil_nao_volume_4.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 4736 bytes
SHA-256: 2ba054bbe53be21b9e34c6f2dd733a944f90738832ff418c3e0e46899444a2e6
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 12160 bytes
SHA-256: 97048e25437e4f5a204f1ead723a1a68141b1d147319bfcd84db7313d5fc39a2