Malicious PDF — malware analysis report

Static analysis result for SHA-256 917ff6bca56582da…

MALICIOUS

PDF

68.1 KB Created: 2021-09-14 06:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c33cf58eaad8fbd24e4edb72ae491535 SHA-1: 85b6c8d7a78ecc3f45311ede9f7b66e99bba5967 SHA-256: 917ff6bca56582dacdb0d3a9ecc9c2e4cc00352dd68adb0a811a6731ee282633
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated and appears to be a screenshot, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://canxetaidientu.com/images/file/68547652387.pdf In PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/99453163191.pdfIn PDF document text
    • https://parc-hotel.info/file/33718076748.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/dunejedosu.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/kadukadudetuju.pdfIn PDF document text
    • https://activepymes.com/pub/file/laroxidusozezole.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/xolan.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/senowodaturuwom.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/77314278750.pdfIn PDF document text
    • http://learningkey.org/userfiles/sokuxogilibekutu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136727a33a48---nozes.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/detujebenunagodalekoba.pdfIn PDF document text
    • http://dejede.com/userfiles/file/60055151236.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/54482138981.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/21742717956.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/mezibazumafejevevefus.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/16341865786.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/lobixatugepijoxevejuse.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/ruludefuzen.pdfIn PDF document text
    • http://webs123.com/userfiles/file/26953190963.pdfIn PDF document text
    • http://risme.vn/files/wofasotavufo.pdfIn PDF document text
    • http://p-energo.ru/content/file/19649106451.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bopabi.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/barinuvixosepemo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/69298754879.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/78198306060.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/vasujevupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vision+of+shadows+pdfPDF 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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 13924 bytes
SHA-256: 8da19b752fb55ed582b028cbdeab052f2c4b6204c5869b37e479c3de8aa592bb
font_01_sfnt_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 10272 bytes
SHA-256: 18d4d43454e0260cf1b691a7564c9352a22491192cb3c1d36d7c88c00978f57f
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1