Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e90d9da0822417a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 03:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2898eed9baee59bb180c89a70327f8af SHA-1: 3b4db5dc40c83f4faf6f8b63ab48741615de969e SHA-256: 3e90d9da0822417aaa4e8a44296c71066bc50b8e89e3beb002607efb8d9bbd30
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many pointing to PDFs hosted on various domains, suggesting a link farm or phishing campaign. One URL, http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26aeab68---11279124091.pdf, is specifically identified as a link farm on disposable hosting, indicating a likely attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26aeab68---11279124091.pdf In PDF document text
    • http://dr-temt.ru/images/file/zitatep.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/96692764623.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109162156503690.pdfIn PDF document text
    • https://12shio1.com/contents/files/43116908864.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/suwuvomunolovineruxaje.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/88708207219.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/serofevujaso.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vepemeripepe.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawaxowuromejasavomuro.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/55080463079.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/jojekodavarati.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904012139.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/74025163324.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b7df1ec4028ae452bcfe04ef7a51be4/bilexudarudibudolusukuk.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/bupogexapisikiwumavatakiw.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/57948993112.pdfIn PDF document text
    • http://faradbox.pl/files/file/pefajepupixolowetuxi.pdfIn PDF document text
    • http://willbramephotography.com/91839011029.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/janat.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/59799190526.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/sukobukaderegijexupilof.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60077117951.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/gusowojoxinibesifulo.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/vawefarewebaxozapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+textra+messages+to+new+phonePDF 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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10844 bytes
SHA-256: 7ac81eec08bf90eb739cb8b97557e990634d39ed11d4132f4d5ea5d2b36bd6bf
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 17112 bytes
SHA-256: 43938cb9b710676a7c3ea482f823c4dca35d8bfe712807a6fa777f1ada416a9c