Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8149cb974ed046a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6c611d676587f1c6a5d8e82468d5670 SHA-1: 1f2e8c312b8f01ac64ca89693c7f5cc501b869f3 SHA-256: c8149cb974ed046a65c7e60db63050b5b2f94f08bba0b902de88b2dc34099d0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable hosting and appear to function as a link farm, likely to distribute further malicious content or phish for information. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://oniceh.ru/uplcv?utm_term=5th+class+science+book+pdf PDF link annotation
    • http://perksys.com/userfiles/file/34666152977.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/94544053278.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/xesanazebe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/jeguwekexuwiraruke.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/82484968691.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bifasamadasonebixofedadaf.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/xowefoso.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909120124668153.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kutepi.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/11782783885.pdfIn PDF document text
    • http://moneymaker-gold.de/files/13592555936.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/27518776877.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/93877347011.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/govezedu.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/vidugokorigokunusuradepa.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/80073046702.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/57474259117.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/77363564521.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/belebivejibudadepeb.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/numetuvosudire.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f3f78106d57f22d4e883c0b9664989b2/32755875101.pdfIn PDF document text
    • http://metzlerranch.com/userimages/90791536617.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bemimo.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/70425986513.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/jemegitaleradilasaruvu.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 17996 bytes
SHA-256: b45fd4bc237132567f1ae8dcc54da6981b67aea7a28f5f959ca10e9b48c11120
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10888 bytes
SHA-256: 69a2a480919e6df755f84f53aebbc4516e7ba929a6aa047b6dbad6d9bad1cc68

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