Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea42d96cb8ffd756…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 13:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7afbe8f193f7721651a3466c4e27550 SHA-1: 8a9aa85e8398ae6f2b3473660419639c12eb1e9a SHA-256: ea42d96cb8ffd756fd992728d0df74ba9323eae2e02d9d8e1185080bdb8de2e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous unknown URLs pointing to other PDF files were extracted, suggesting a distribution mechanism for phishing or malware. The document body is heavily obfuscated and contains no readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a1790e78a5dc0fbb04df16b860a5fa02/fibemomazij.pdf In PDF document text
    • https://warungmimpishio2.com/contents/files/bivusenixisina.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/63574226914.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/44246434083.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nafaja.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wizuselekaved.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/kuvuvodo.pdfIn PDF document text
    • http://beril.cz/userfiles/file/59062421356.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/nexopenud.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/43864889972.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/87433074230.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/92398940324.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/87317030128.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/50331167475.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mogagedivamiv.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/34795854274.pdfIn PDF document text
    • https://aneri12.cz/res/file/wuset.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59007490952.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/pibaxenetixab.pdfIn PDF document text
    • https://wecareprogram.org/images/file/bavakudozuwivuvifiw.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nuxoketikisekikotuxezexi.pdfIn PDF document text
    • http://analhospital.net/file/files/sedenojujalafixigemako.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/77398902417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=os+map+symbols+worksheetPDF link annotation
    • 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 17352 bytes
SHA-256: dd3be0cf454ba22cbec7aa60f9239cf90d28cecffb3bb04a29ac9ea25a0a0b3a
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10776 bytes
SHA-256: 1c8ed19af8806ca7ce84501345e5ad76c862774816f674c63c565466f9379575

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