Malicious PDF — malware analysis report

Static analysis result for SHA-256 36166a30e599b734…

MALICIOUS

PDF

111.2 KB Created: 2021-09-16 19:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95193d243a5a30007568fe7bb91ccd3e SHA-1: 24d6c00245ae180e1837fb4b9208490dea4c8b54 SHA-256: 36166a30e599b7349d38b578eedea51b20eb6f6226ecf48db6e6d006f8b922b5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary attack pattern involves directing users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cheniou.handysociality.com/upload/files/54842167089.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/kiwojet.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/41791920715.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65477104662.pdfIn PDF document text
    • https://haidangpc.com/contents/files/ninokotivut.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914050914.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/89165549589.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/fukivofogup.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/5775645756.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kefoxibebuzenekugem.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/xumuxoxin.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/kikogejunojate.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_010452.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/23962776529.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nolenemosinusodotimixi.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/derilosusanon.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/gizoro.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dezitosukej.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/30167544179.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/65b9dd2ae573182a7c3886979c57e283/wofekuboxugeva.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/71547505172.pdfIn PDF document text
    • http://sin-hua.org/userfiles/natola.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/71002742977.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_102518_126.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109101948523694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=electromagnetic+spectrum+shortest+to+longest+wavelengthPDF 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_off00014977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14977 11056 bytes
SHA-256: 987009ccccceb568b5ceac390e3613815c047c9843a98f61213a692b26a8eda9
font_01_sfnt_off00016313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B25 19684 bytes
SHA-256: b65f6e6f02069d556ce19c2cd7c3e1424bf3c68347a5d022194d3f4edbf7e81c

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