Malicious PDF — malware analysis report

Static analysis result for SHA-256 8985f38ba604fe06…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 22:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb51ce86a5023986ee9cc93e4dfb144d SHA-1: c5976e190dd2f614640fbe5d89caa6b9473907d6 SHA-256: 8985f38ba604fe0648948e9b2b5f901357dbd86667fbe5562254ae64541deac8
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one directly to an IP address, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dalycity.com/wysiwygfiles/file/17994367110.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tigurirojabojolesej.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/satunomuzepesipolofepebi.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/8988937811.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zurovam.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/jutimekapesi.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/3449104636.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/3223680632.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/pinowobewikivososilepo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/34993675164.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/53165125015.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/jefobixomarelexotom.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotizewanubapubebosise.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39737321003.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lufarosapotezapasuvulun.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a966411a63---21946212439.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xiguwanuzowakitojij.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xudorazu.pdfPDF link annotation
    • https://anaksemut.com/contents/files/86023332798.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/58696851933.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/xedesafa.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/dajonibetigomesuzobafezur.pdfIn PDF document text
    • https://tuinvandecruys.be/file/28651118765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+third+day+of+the+week+isPDF 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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 17228 bytes
SHA-256: 93f167f6edc4a46d4b1553bac4d9eed938d80693b6fe68cb95af712902c30489
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 10556 bytes
SHA-256: c405718f03c637049d09827ea53059783381cefe281963da3ef659c144de318f