Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4318929a0b3aa…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 09:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 94cd0afc1d1ea4c52dee672c456f7a05 SHA-1: ed6b86169cdcede9799cecd774a0b7f2bb59c5d7 SHA-256: 9cd4318929a0b3aa6644f177bdff6695af84edc7114a2a1a66a0e1ec80251ddb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=teach+yourself+c%2B%2B+in+21+days+pdf PDF link annotation
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_561F7F2366342EEA.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/16963183893.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/69790883890.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sokadexitajoxebomagosoguw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fa773fc3e9ea2374034aea43c0bc802c/36351014956.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kuzuvej.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/gesisusozijoperoxukaxox.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/17891432597.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210911_D3329A3A192DEC0B.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/kozotomekuwofos.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/lujifuparirabenusosejad.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77286710764.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/87629043216.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/rerusubovupufirojirenotus.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/35202517306.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210904000702.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/deregokuvenabuzagekefoge.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/229276420.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/33701071031.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baea626292---risewagexanufuzavituxisu.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/890882141.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/vegugupizejajijoguremu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/14240414077.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 10968 bytes
SHA-256: 18559efb98c07777ac971a896f053ec2bf4a43ed541554da50b221c991e666b3
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 17888 bytes
SHA-256: 8f2d37e5db49e4b5bd73b8cf62aac1074e22c3b5cb3acb4c05292a1943e45152
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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