Malicious PDF — malware analysis report

Static analysis result for SHA-256 975d9d330e0257bd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 09:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bb67f6817ec82a04948b75a1f325f347 SHA-1: 35f862ecac9f47b6aebe416ac24e2cc9379d0358 SHA-256: 975d9d330e0257bd969c927ca38f6b0668ecc5ea4eb67c48cf14bdb6c3a20e9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xnkvinatimex.com/uploads/files/fezejofunimilebalax.pdf In PDF document text
    • http://art-lan.ru/uploads/assets/file/23139130052.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/83410125831.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/lozononasatu.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/penijorisive.pdfIn PDF document text
    • http://imbirimbir.ru/files/bekoxujuzaval.pdfIn PDF document text
    • http://stevis.cz/files/file/21466233313.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/51171580266.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/21c189ea9d1c94093b3e7300cca83c4a/pakosiwijosigeponulexaxex.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/41113383222.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/97664914816.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134303d8a92d---regilamopujekefikobepib.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/69257231799.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/polaguzunokuvujakuxo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/paxezavukozug.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/47176351610.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/62532867230.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jopisetevo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kavogiwi.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tuwokosukov.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vumowufadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hack+wifi+password+using+qr+codePDF 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_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 17856 bytes
SHA-256: 63999baa92c50af512c62bc88f998cd958f5afb749790da52424c60056b6cea2
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 11268 bytes
SHA-256: 66a232fb0a65af2fd84b3facfcadb4441965835619aa90698b44f1c47ae39870

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