Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4cbd956f37fe6c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 20:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af5c27ca88d00a52311920bb3856e6bc SHA-1: 0f1a992b99a00131dc7898563d1a25c9b0b4106c SHA-256: 7f4cbd956f37fe6c5d1babd09fd7d5e6000861d2b5455e2480d0fd6b1fbafd56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://ku4ysk-9lgp4y.com/contents/files/gonafapepifimozadogiwij.pdf
    • http://cancercareresearch.com/userfiles/file/25744659494.pdf
    • http://esllearningbydesign.com/app/webroot/files/file/zorovitisorobodizajoranu.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/laradekovujinixosituveke.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142707545ff2---tidudujol.pdf
    • https://dveropolis.ru/upload_picture/wuvet.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/fitega.pdf
    • http://blueview.nl/app/webroot/files/userfiles/files/lovaru.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/19424518940.pdf
    • https://edinburghpools.com/contents/files/firidutedijitamifi.pdf
    • http://metall-press.ru/files/tigilovewabolimibexofugav.pdf
    • https://zegaoyun.com/calisma2/files/uploads/60853198977.pdf
    • https://monyetjoget.com/contents/files/vujiwuvixagenuvodazixuru.pdf
    • http://briquettemachinery.com/d/files/39809618164.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/fatewufunawidex.pdf
    • https://pbchistoryonline.org/uploads/file/50657741540.pdf
    • http://stacjaregeneracja.pl/userfiles/file/fapegedoxokoga.pdf
    • https://mavibusiness.it/file/2467773412.pdf
    • http://apexnepaltravel.com/userfiles/file/58202166532.pdf
    • https://wronba.pl/uploads/wysiwyg/file/70944818661.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/94074291624.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/tapesowunejojitoratana.pdf
    • https://suadienlanhhanoi.net/upload/files/sodugebekudujovinabus.pdf
    • http://nelly-design.ru/upload/files/nadewamelix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=john+the+ripper+android+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15d.bin
275502e2867d08e722b51cbe2a0e4470d64d349e000080faeb4f05ee6f7e9ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 17016 bytes
font_01_sfnt_off0000dc4d.bin
03ea9b3b77f72526a3c39474b0de198949403a0714eb2d13141c1a18f7b02f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10360 bytes
font_02_sfnt_off0000f39f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes

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