Malicious PDF — malware analysis report

Static analysis result for SHA-256 464052e4034038a9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 19:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31618f4abbc200c290983eee3e023b43 SHA-1: c4a57a06e19bd8de152a5dfbd545ec23c68a1dcb SHA-256: 464052e4034038a9ba3d0a407027ad76851183d233c722c97b28e1e683b97ada
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm structure. The PDF's primary function appears to be redirecting users to a collection of other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bdn10.cz/files/file/55211948046.pdf In PDF document text
    • http://chalappuram.com/userfiles/file/34004421150.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613779533f46d---62930582304.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xomalidiwug.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/21088405153.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/fivedujawevinum.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/maluzumemolag.pdfIn PDF document text
    • https://servauto.fr/img/user/file/zinesekemileza.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d6b7921c30ea175cf8263e124d087da/45867441388.pdfIn PDF document text
    • https://finliz.lt/i/File/fovujilugoxipuzada.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/60587235696.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88367449988.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/51091935506.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kitupimedoripufodo.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/88746790151.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rixevi.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/59660151888.pdfIn PDF document text
    • http://rs-entp.com/upload/file/dapovewowidiv.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/77652321164.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/59504268133.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/xagawajadumigirabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+my+phone+number+on+androidPDF 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_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 11180 bytes
SHA-256: 26b92494804d69c92a0ec37db8101bc81e616bfca62bf8384c15cec3f97257be
font_02_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 18032 bytes
SHA-256: a0acc3a87c52c360fa150f03d30b3ec8adb445d9dffb59eb637b824ea4a4484e

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