Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a936eafa09e0f34…

MALICIOUS

PDF

67.0 KB Created: 2021-09-26 17:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81508cddcef913862ac57c489d915e10 SHA-1: 478a85a0cdad5bcb15b1fbba9200cfb657a063e0 SHA-256: 9a936eafa09e0f34a855b2a24cfbe45b0c08407f9a55bfcaf5c5657aad6e4e90
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns, and is flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 66 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 https://sjamsul-hidajat.id/ck_uploads/uploads/files/jebese.pdf In PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bebivokafogogepan.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/87079893921.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tubawefeporufanitivote.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/witidazata.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jevudos.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/77704338152.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/pagujeposobi.pdfIn PDF document text
    • https://huanghecables.com/d/files/80825315953.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/97474805964.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/nisuferawutuger.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/31761122839.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/luviv.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/47157447539.pdfIn PDF document text
    • https://lecachet.fr/docs/files/56344537180.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/51861654524.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/25722585760.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/88541325730.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/10841647226.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/69519367737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+legends+hack+apk+2020PDF 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_off0000a9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 14332 bytes
SHA-256: b5a9a76ae5fb4f312179db6acd0bda307be92390f48817d451e7e56079abf0d0
font_02_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 11060 bytes
SHA-256: 28285f88559f40b58a79500bb7261b5a62c558adf0d195dc6bc00d0113b6a6fd