Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8630d5b3af29a4…

MALICIOUS

PDF

67.4 KB Created: 2021-09-17 01:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb0b1bf623376db39c993ce270ba9442 SHA-1: a0370d08aef20bb6abc22502e2d6f56c6fd7edb9 SHA-256: cf8630d5b3af29a4be75c1d4ba1e481443651819d8fc24c1c7ddee5e41e235ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs pointing to disposable domains, identified as a link farm, suggests a phishing or scam campaign. Although no scripts were extracted, the structure and external links are indicative of a malicious document, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://classicalgardenfountains.com/uplds/file/tetoveruxajonilolalavi.pdf In PDF document text
    • https://svetplus.com/userfiles/files/kolomujewikisajivukoxuf.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/kegifuradekifinubeg.pdfIn PDF document text
    • http://intertribo.sk/files/68608032146.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/89031950823.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/kuwekewejazevalupewad.pdfIn PDF document text
    • http://haphadoor.com/upload/files/86810657231.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/62551695464.pdfIn PDF document text
    • http://flomojapan.com/upload/files/vofewavafosuwelajivireb.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6fc2c0cbebbc0686fb640160e6c33821/jiwitis.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/82448005516.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/67229889833.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431b4452194---15076164070.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/90849920353.pdfIn PDF document text
    • https://ienter.bg/files/gotixoxexegilajosabi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jupevaroduzek.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/diluxu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/16959939621.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/85356973737.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92405962985.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1627096115.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/77183024169.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///1140280751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+eroge+downloadPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 14164 bytes
SHA-256: b48ef3710e1699f7a2571e35290766143a8063e09771fbab18c994f7fe275000
font_02_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10224 bytes
SHA-256: c1148e21bdf67b1fde5a36e63df643e6ded6a9e38b5e0db7851bcf527d1fab39