Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4f9fde636c73d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 00:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7687f5209fcdb325ee25a74a39f3eb67 SHA-1: f68889fcaefd2e0da28ea33a4d23a1be85251c8c SHA-256: 80c4f9fde636c73de17f49b9b9590cb97933720a16394e705b88df5f806be06f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to numerous external sites, many of which are hosted on disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://orderkai.com/uploads/files/47518428796.pdf In PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gurinafepigaguwupefafewe.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nixufad.pdfIn PDF document text
    • https://kratky.eu/files/file/voguwupupuzug.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/mafusojadixazaribudoj.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/tizisegubobaroxukutuziz.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/xaxetajaru.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/tezasagon.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/vuwagovepujiw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ade9df942---65412499451.pdfIn PDF document text
    • http://bdsductri.com/upload/files/53253509743.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/10654831142.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/nisurameduresexilotur.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/60569194336.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/kenemopipademupovafomej.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/27801506327.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sixedaxovox.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/renelivenaduzunodo.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/42653259227.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/gigodix.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf0e1fd97---fugogu.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/jijexipuwilepoxozinikoge.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/jadisukazuxuj.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mapagavumanuzurozisemod.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/vefiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hevc+codec+for+mx+playerPDF 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_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 10592 bytes
SHA-256: 7ac5a3c0f284bf2bf3f2dcbc8996fd712ab15d6d39bcd6238cd457e30d7aa62a
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 17644 bytes
SHA-256: c2a6fe52d624caa945a59064efcd8fe5eb251d4a23240e2b8a78593c40fbf17c
font_02_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1