Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69581328d4d6a54…

MALICIOUS

PDF

78.0 KB Created: 2021-04-17 08:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 41ba747d096dce03b644ee6323cbd756 SHA-1: d1ccfad92106d9361147ff27e35286711b1c16fe SHA-256: c69581328d4d6a54774cf7d3570e765a69a51860c4518fcd76a83bf18c3ab017
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=are+tp+link+switches+good PDF link annotation
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/2d218c6a64d65a5.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/71597584837.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/cashflow_game_instructions.pdfIn PDF document text
    • http://lukunezevowazol.sportsontheweb.net/medical_dictionary_online.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/pafujezilumas.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/5238552.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/91a70a103b4.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/8031379.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/8336555.pdfIn PDF document text
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/72c4236e.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/ec112a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/14877824583.pdfIn PDF document text
    • http://tofekerotireg.rf.gd/biology_textbook_grade_9-12.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7960ff0b7abc4efbab6497855b204186.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_942c3209c7bc4be3babee576b63e0166.pdf?index=trueIn PDF document text
    • http://rawegutidum.onlinewebshop.net/84398035193.pdfIn PDF document text
    • http://tudegelufer.rf.gd/solajurotuzobozo.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_5b953febec524371a6aa2405dbd87e5f.pdf?index=trueIn PDF document text
    • http://bikenuzuxidan.epizy.com/30554069729.pdfIn PDF document text
    • http://zusobudem.epizy.com/rabegixuwijuwazajopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/venaza.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/85746844263.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_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 5272 bytes
SHA-256: cc137223cbff7f3800d58e363d6171ffa929928b32a8a7c236d7bc4882a23e4a
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10660 bytes
SHA-256: 2c30d9d2999c78fa1303adb52adf16e785bf275c37ab27e9d2323b74ef7f11f5

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