Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f440cd96372831…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 09:01:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ae9558c3b869aa73abcacbfe59575cc4 SHA-1: 19527001df9150410c075de64ef0fe6916340f13 SHA-256: a3f440cd96372831b04860e6861da0282693167320ef22653de350dec1ca574e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links pointing to various disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The document's apparent purpose is to disguise these malicious links under a seemingly innocuous topic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=how+to+adjust+beats+powerbeats+3 PDF link annotation
    • https://radiduma.weebly.com/uploads/1/3/4/3/134362755/6234727.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/14c088986e731a.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/5oThc3B/jenedokuvosuwukena.pdfIn PDF document text
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/pekoduvexularako.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/GjbeNSj/nugemodusugorarakirisizus.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/gMcwhg8/47507151111.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/lisuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabunufu/gfjaiah/alan_walker_faded_launchpad_project_file.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/3jhjghc/sales_job_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446378/normal_60557724e3844.pdfIn PDF document text
    • http://kupiokno.su/dofofagilevupawor6xti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_5fe7ff01dac65.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/jcYibdn/16398514115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6042ff90bda80.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/gewome.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/igjf2zG/antibiotic_abbreviation_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5fc6af307be6b.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/hxJhgUn/gymnastics_training_bar_for_home.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/UWky151/rujifijogorasen.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/a55a907103e13d.pdfIn PDF document text
    • https://gaxirakim.weebly.com/uploads/1/3/4/6/134605205/jifosogota.pdfIn PDF document text
    • http://bred-enligne.com/zibafobepifuxutobocpcmu.pdfIn PDF document text
    • http://csxmoney.info/5318763977w9qrs.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/kjeahdp/nodabiterenugitusepejiz.pdfIn PDF document text
    • https://mefojenunir.weebly.com/uploads/1/3/4/3/134310277/2094336.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 5352 bytes
SHA-256: 5815eabd6ea29fa955597c1a189d344d47e83e43429d6f68662269d837bacceb
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 10880 bytes
SHA-256: 530ec044e66dd7571ab75bf29e872af81c8637e73803b61749c0a3704250ff69