Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e8c1c012e8f620…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 01:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4913d3501e0a5f72889a3a139c6c2af SHA-1: 5796940a521ad7e265aea206f9618a405a9118de SHA-256: 03e8c1c012e8f620ac6f386d16843236ebc87ffb4666fd86bf3e5d41ef6e0ad3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing/trojan by ML classifiers and ClamAV. It functions as an image-only lure, typical of phishing campaigns, directing users to external URLs for further malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a broad phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 67 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://nomylo.ru/uplcv?utm_term=the+little+hours+movie+online+watch PDF link annotation
    • http://studioboscono.it/userfiles/files/zojizatapoku.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210919120959_bm6gl4.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/juxuxotukojinipinibosetiw.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/vegetilip.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/komijixidudi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wosejasimokatan.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210912125842981459dbmnbm9gbyzz.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/899300972613e7ae1244cb.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/5611874023.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/22871470920.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/72656110349.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/56301290910.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/ziwemixexepewatox.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/nozinuzegotugiviridana.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/noguwul.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e0a4714d---594396516.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/lejawuji.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/60064095288.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xagututumimu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/37436358605.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/8934299779.pdfIn PDF document text
    • 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_off0000ab76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB76 10712 bytes
SHA-256: 7c5a8ce71b2804addd04b4475bbad03701132a42c0058b59149b6d4dc658755d
font_01_sfnt_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 14328 bytes
SHA-256: 7aaceb0dbbf3277def93caed581a664ec75d6c7e4d49f652160d597307428f1e

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