Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55927bd59d650cf…

MALICIOUS

PDF

91.3 KB Created: 2021-09-14 09:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 329de889d9d1cae063c8a3fc7c42b029 SHA-1: 8eb68853a5b87ac56341db82af3a83bcc2bf6a99 SHA-256: c55927bd59d650cf4b48e22f04dafcd04e0ac97c715166cf02e90a470c2c20c0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://0924055971.com/uploads/files/202109130621563188.pdf In PDF document text
    • http://labsshop.com/d/files/31200099470.pdfIn PDF document text
    • https://nasikampung.info/contents/files/saxazufaxuxusawumexivo.pdfIn PDF document text
    • http://oris-am.com/editor_up/zipabudonipuwidoz.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/70261642827.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202194153133227.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/dalujofari.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/30020469052.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/90380118704.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/54862546221.pdfIn PDF document text
    • http://packamate.com/userfiles/41191395688.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58840096731.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/folukebib.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/33278805964.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/palazig.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/59280074181.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/tokegewekamoxakatu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/23qljfdqkce5davja3hd4e7qlt/funubaneno.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/62ba4bc6dacba3b376ec9bc6d93b4122/peruvumal.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/16546121856.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/ludogepupumu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68988844770.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/nukonunuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=little+women+full+movie+freePDF 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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_01_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 10252 bytes
SHA-256: da2541832fc8f348bb50129c8b5e79f3f83598841cd39d09ab7e475d87062c62

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