Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca0efeb94aa5d24…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1c90bcca1db3a1a40a7f43f96182ae9 SHA-1: c1360ce773bb6185704d437ae0dcaae5b7f5dbc3 SHA-256: 3ca0efeb94aa5d24e9e6965b4828382f51240bfe9bb423bb2f0ae8f728a46301
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable actions. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a campaign to distribute malicious content or phish credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 69 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://veterinariomauracotti.it/userfiles/files/4422945079.pdf
    • http://georgekoldun.com/var/upload/file/mirejedajabunolefanurep.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/pezeg.pdf
    • http://www.hussco-steel.com/husscofiles/files/73392435542.pdf
    • http://ahnil.com/userData/board/file/70502859117.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/saxubopodugiguziwum.pdf
    • http://7166867.ru/ckfinder/userfiles/files/61715927101.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/97590358917.pdf
    • http://studioesflores.pl/obrazy/file/76762539653.pdf
    • http://korvet-sp.ru/userfiles/file/kixuxoxegageni.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/28a6012d8fef7fca01f6397e644e5e05/67113562461.pdf
    • http://zsdbiopharm.com/upload/files/pinuguvebotarero.pdf
    • https://tckontrola.hr/files/xebusisudibunejumutaru.pdf
    • https://notarbrazda.cz/userfiles/file/
    • http://4reality.cz/userfiles/files/41626219333.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/pogosi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9d7e7d38---79027060438.pdf
    • http://primethailand.com/ckfinder/userfiles/files/xuwoxeneborifibopifenate.pdf
    • http://vbond.hk/editor_upload/file/tabamab.pdf
    • https://ms2oke.com/contents/files/dilezakifofuvuxed.pdf
    • http://mirsistem.com/depo/sayfaresim/file/93292026050.pdf
    • http://teplospectr.ru/images/files/digiwope.pdf
    • http://thrifty-uy.com/files/others/22220874109.pdf
    • http://vitccorp.com/uploads/userfiles/file/ziruveferobofibav.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kebafatodadak.pdf
    • http://holidayservicemarsala.it/userfiles/files/murotoguzujatazadu.pdf
    • http://rogersdesignhouse.com/uploads/files/47718677829.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=speed+booster+faster+phone+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a7.bin
b208ebc3c70f22143d69da55d1f44ac2eba09af28c42498e4ca284b7e1359170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 10764 bytes
font_01_sfnt_off0000cc18.bin
0c41103bb1ea7e8ba3f9bbdbe0f07fe95ef32d95757fa57cd62a5a1afaf42d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 13696 bytes
font_02_sfnt_off0000edc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16792 bytes

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