Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6518e76b6bd2d8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 14:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 151a2e9916778690c75696fe480d1f61 SHA-1: 7f862cf1980248aaef04f7ccf0e86c6943bbe993 SHA-256: 7f6518e76b6bd2d838a4bf8114482f7e70c03410a215b83db1abf026f963a0c6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown PDFs on disposable domains, indicating a link farm designed to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c0dd02c---negapawofobubawuvi.pdf In PDF document text
    • https://hanedantoptan.com/upload/files/tilisonoduwadu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/30612813612.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/42715095612.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/panoxovugazomewuxa.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/19057000620.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210902_114901.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42883038579.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12953125941.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/87492611003.pdfIn PDF document text
    • http://winso.tw/userfiles/file/21307985591.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/giwakavilerozobumevowibov.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/50550690006.pdfIn PDF document text
    • https://hse.tw/upload/file/wiriwamovamo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ce7c41b04cc928440a1591601a333f98/bawob.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/zesuxoga.pdfIn PDF document text
    • http://rhondachem.com/d/files/48161538184.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89334560836.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bavujifojitu.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/lipolevawudimemakelusevu.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/53133489999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+see+who+viewed+your+profile+on+instagramPDF 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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 17720 bytes
SHA-256: 776820ccd43f4b96ef56e0f0765ea2ac6c9636312b654635a30602c4400018f4
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 11304 bytes
SHA-256: 8f2eadb065df4c91c2829b101c813dbaedeb57156e36133a7ae1bbdc35f91142

Open this report in the interactive analyzer, or submit your own file for analysis.