Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac632e884d2ab54e…

MALICIOUS

PDF

88.0 KB Created: 2021-04-07 22:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 614b2e2c000aa8e9344ee3f5746960f8 SHA-1: 9fc80d5040d0668142585fce3c5e6d01a276de13 SHA-256: ac632e884d2ab54e6f6a881b7e464a0805f1fb6e6164dfb96e20cf89a391a2d3
166 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious PDF URL, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'Dante inferno painting meaning', suggesting a lure to attract victims to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://leonvi.ru/strik?utm_term=dante+inferno+painting+meaning PDF link annotation
    • http://helplnstagramcontact6088758.com/vasabikozijiwuc3a2j.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/b_262_bobrick.pdfIn PDF document text
    • http://baxaduvagabemem.iblogger.org/getting_started_with_spring_framework_book_download.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/afraid_synonym_formalmok1w.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/ronekijifovija.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/makiwu.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/folemibumixereb-fenumafisefogo.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/952444669188dz39.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/rukedabusap.pdfIn PDF document text
    • http://apelsins.space/wahl_trimmer_battery_745-8000jpu1.pdfIn PDF document text
    • https://motapesuna.weebly.com/uploads/1/3/4/7/134749044/9dced0d45c0d5.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/56d15ea597fbc6.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/donem-wiriziwuj-jibesetilebivok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapewokadovusa.myartsonline.com/central_venous_catheter_insertion.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/86410472143.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/batoxuziwo.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_44e47e1631f247dbb28706a3ae7baaf9.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_21f25bf494084411bb6aaaf16421fb8a.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_5d755006e37b4e2faff0605efc24fea4.pdf?index=trueIn PDF document text
    • http://xikusaduxofi.atwebpages.com/53321688807.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_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 5012 bytes
SHA-256: f397f8ea31487c5be4316ac0a7c1f15622a79f5bef723a5cf2c396ef91d13fe3
font_01_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 11196 bytes
SHA-256: e44594325ed48840476e0ebb6cb0c49e921f8b88da1c8c501c2c822514b49ce8

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