Malicious PDF — malware analysis report

Static analysis result for SHA-256 8795167c243f0b40…

MALICIOUS

PDF

74.9 KB Created: 2021-02-21 01:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45ba09a415c2742f8305a819600bb729 SHA-1: 5147d6af745b7ceda7391e1847011a09a1f06d84 SHA-256: 8795167c243f0b40fc277db72f1c8ae3283fb5d007090d8b54d70fd990ce50e8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The primary lure appears to be a search result for 'terminal leave in the navy', directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+terminal+leave+in+the+navy PDF link annotation
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/vozopuleweperejopom.pdfIn PDF document text
    • http://vuxuvex.iblogger.org/sepabami.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/cgshfjd/83047522404.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/1254720.pdfIn PDF document text
    • https://cdn.sqhk.co/jeposanop/igQnNrP/6824411162.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/jovorovodup.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/besirilupirif.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/ZzkkUja/pawekovetugekoluzafomi.pdfIn PDF document text
    • https://tiparopodewab.weebly.com/uploads/1/3/5/3/135340776/d322dd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagupim.epizy.com/jegililumepodomesapi.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/33908035556.pdfIn PDF document text
    • http://xisapedugifado.epizy.com/xuwusu.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/koromegulerexodimukux.pdfIn PDF document text
    • http://jelugubafegoj.rf.gd/bopani.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/nanujoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/68288475062.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_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 5100 bytes
SHA-256: f75b07de83a0b76643bde785826d462af6df687cf924ae7b61e8d6e10de12bb6
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10772 bytes
SHA-256: 536a358d2eac73becb12897094356434b92b6cb2457012ae57a9a707dd75fe09

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