Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670966ea1db30f0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 11:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6206920b1e8ffbb6c947f2a13c7bc925 SHA-1: 5b246cf62bad181afe6238a1e99a19c57a4c4362 SHA-256: 7670966ea1db30f0447f33a09d3316f5403c6c00062ca9b416d8d8e52f1606a4
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or credential harvesting attempt. The presence of multiple unknown URLs further supports this, as they likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16142d70d5de3c---87556741903.pdf In PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/8775572077.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/terosamotaxutow.pdfIn PDF document text
    • https://triosms.com/userfiles/file/vitetosibirovib.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1987590344.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55daab60---48498923402.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1vf7ke9ujj2sdbgi1u2gcp5qa/bemeripavujasapefara.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/podosovirodavav.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/6163022658.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/35153605148.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/97298525227.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/45757629699.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/87369105409.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/mapofoga.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/potiwibedevumarizif.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/85134469937.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/ritulanemonaguj.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/jujabanozuridemenu.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/metutugerunixukakefuxavo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090917041311.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/42320877895.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zuwebaxuxipoda.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/kedixobotuza.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/xejigasijefizu.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/76321745007.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/93250061560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+navigation+for+androidPDF 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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 19780 bytes
SHA-256: 9e4307e543199c44ee5f341f26bc9b9fe7144c1560cc0172d0c799251e90da76
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10600 bytes
SHA-256: e0d0dcba96b99aa852d13f2b0e965bb3cc40c57721166b24b99c785c54ab921e
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1