Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa705795e7be3f13…

MALICIOUS

PDF

72.5 KB Created: 2021-03-04 16:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c40080fd851d592e16e5534c10ae4ed0 SHA-1: 08219c5063be1649ed6f2b5b1f3c8f6d8210cde9 SHA-256: aa705795e7be3f13726299a8ab5fbd4d993e324eb95bdb3cec84128a0442cb18
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm containing 30 external links. The ML classifier also assigned a very high probability of maliciousness. The primary purpose appears to be directing users to a large number of external URLs, many hosted on disposable domains, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=4th+grade+math+word+problems+multi+step PDF link annotation
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/sijagub_pozijenuboxuta_sikawigig_fixasoluxom.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/00f278.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/4336538.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/169964.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/bia2Liw/best_free_ebay_auction_sniper.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/mizabogiwidefok.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/hjDPhif/easy_pool_trick_shots_to_do_at_home.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/62292.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/cMiahjf/love_test_app_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/F2RHUji/70612651444.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/zhgji5y/57198032185.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/gDx1mha/turbo_dismount_descargar_pc_2020.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/bagotofuxaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarososibi.rf.gd/witumokebuxudivubejin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beee182c-09ea-4c56-9fbd-bb52ff8ae78a/cuisinart_compact_juice_extractor_reviews.pdfIn PDF document text
    • http://fomabobas.epizy.com/catalogo_3_avon_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea82444-cba0-49a3-83ad-ae8b0d177f79/57301531627.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 5596 bytes
SHA-256: dc977e3c00b32f3d7df494a0829aea16bdea639a473ad2ab6100054804729bd9
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10108 bytes
SHA-256: f6a0acdb2ba41c26460a3db131a96a52e0be0c7874309b9ef18cd9c8b7a6ba29

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