Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b92208bd1f474…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 07:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 588cb73281770a0ae280e9b8fcefeff3 SHA-1: 7114a7775b989c954ea3633d2516b83cd0389dfe SHA-256: c55b92208bd1f474bcad574a02be50115b03ddbd50782631885c6e636e268dbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating an attempt to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of many links on disposable hosting. The authoring application 'wkhtmltopdf' suggests it might be a generated document rather than a typical user-created one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://aesg2edcv.handylover.com/upload/files/29659552640.pdf In PDF document text
    • http://origo.ws/userfiles/file/67489383183.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/roridanurigajola.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/28473040506.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/25215954553.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/66735590944.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/12624764336.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/43297922044.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/dowidobulabane.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/75923586827.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/31958581518.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/59582499605.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zuropobazopazufexumowisam.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/66563324929.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/37780260949.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/25627679100.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/botebukelewexuzupuruderi.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/xezibolozezuvebaleki.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/66662493531.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vonogokon.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908035747.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0f2ae0376049c03437eb9318894ceed/biniwitekekuseberusabavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hydro+power+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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 17736 bytes
SHA-256: 37a233216f409572e556d867337806c1811e1b04bd0d1defa1a162747823eddc
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 10168 bytes
SHA-256: ff247f571b5a0e4320cb6598aba8745d7bc1f39c8197f2c1635821fcf1d58d47

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