Malicious PDF — malware analysis report

Static analysis result for SHA-256 e359ac1ae142e493…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 00:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23a250ee31a8b2b2e0f0132e3a9e760c SHA-1: 8383c64a87ebb05f1f1330f2697883e32fa78389 SHA-256: e359ac1ae142e493dc385af1331aee27b7dda0c1518b3aab30808bd045dee0c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=android+messages+app+windows PDF link annotation
    • http://www.casasemio.com.br/ckfinder/userfiles/files/19452444205.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/ditezuzubekepitozuxab.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/47674297584.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xosatodusogepulokebu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/wonobawetewusafepije.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/463473369210693ba664b68d11752e1c/83147880166.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/vazuvitovutezejipexixol.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/wepikekexavojajedev.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/97167368885.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210920050312.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/mibizovekizizipud.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/bujusitatoketotifo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/gekozekalaka.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/28311867928.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nisig.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1399ca531282ea3d73c2436976a4d0a4/12050267563.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/felexupoxut.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/monupujegupezekesalizol.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/jotigutegajepa.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/sotuneburir.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/lijiz.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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 16800 bytes
SHA-256: aa4662ed9f8a77a1f870c9d102b4f14a811f60df62f35f7a580a4357582d7cfa
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10656 bytes
SHA-256: b6e3c55c1415129ddfd5460a3e950e53fbbff0bbdde4584adec27349ef55d4af
font_02_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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