Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafea2191d64cb00…

MALICIOUS

PDF

85.6 KB Created: 2021-10-09 15:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be587c15a61384a7d41ae96d73b470b4 SHA-1: ba66145dc2ab0aca144ccb808c1345e517af41ad SHA-256: aafea2191d64cb00b58ec9ddc2373877626f950ddbf079f75ca0b8b350b8d805
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=discretionary+fiscal+policies PDF link annotation
    • http://shiny-baby.com/fileimage/file/1424582810.pdfIn PDF document text
    • https://norservis.cz/files/files/79230034987.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1259956978614b7d64585bf.pdfIn PDF document text
    • http://poliinc.com/upload/files/94385342431.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/dutexaravapimeziwo.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/38611127311.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/9378496541.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/44741010888.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/99760713767.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_d4e1c.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/63243830067.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/runowedazaxijasixopaf.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/ludow.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/faxobuxetaf.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/nufuxezitozivowibule.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/viluji.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/94686491709.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/13114857385.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/vameguterad.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pirewubobijatabofewixag.pdfIn PDF document text
    • http://hbaoge.com/upload/files/98959705587.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/berajesenurexijizez.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/zepiguzifakafefijun.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10588 bytes
SHA-256: ded31b47a1d01a246ffb7142d729ed271a9ac6c3dc0f77ff8a5fafa8403bd5d2
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 18188 bytes
SHA-256: 3ca4c8a08b2102b44c310d6bb09457b1ca1f9a97b3cf483bfe2e4fb6177edd44
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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