Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f9f101bbf7c8ac…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 18:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4da4ea6b7d80f4793dabc4fba538f35 SHA-1: aa0e42d2ccaabf1a683bea030ef54b8707c06db5 SHA-256: 92f9f101bbf7c8ac7ed352b63457f2e1432d2c0502058352671cdeb6044eed53
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-based document with an action trigger, designed to trick users into clicking. While no scripts were extracted, the presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm used for redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.parkwaytransplant.com/media_upload/upload/files/28127769966.pdf In PDF document text
    • https://csp-pub.com/stockages/files/runekexuwaleravuj.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/22851021680.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jumudenumaze.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/71950533474.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/vujeridewoxelam.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/49900475800.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/59751166597.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/vufujedakurodemuwageli.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/potonador.pdfIn PDF document text
    • https://aaaxxion.info/images/file/20167786724.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/55444872860.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f9c3dc6012f5e6a72f3406db51c7b47d/68348303524.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/71321965320.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tolulu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/28021792574.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/45861312130.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/kolelikup.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/10686029278.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/251823127.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/vopexugaratodigazab.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cff9cab30---89013940099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=123movies+shameless+season+11PDF 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_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 14060 bytes
SHA-256: 83f77c280f3970bb2f04ea8043a5ac456146fc140f8c7ffc3de5d8a00e0fbd0a
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 10488 bytes
SHA-256: 47c00820cb37ceaf041e8258ddffe0b53b50fd277a56a268d578d41ff144b2ee
font_02_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1