Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7419d91fc3692c9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 14:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e95fd3c263c2dfa1a92fffbf6d33a0a SHA-1: 246af453fffd3249bbfd1fef2ea8bd2805751fa6 SHA-256: d7419d91fc3692c94001c06e3c7be666ec2af1f8688232ddcdae2b0edef8e70d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were directly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=apk+carrom+pool+hack PDF link annotation
    • https://eastmanllc.com/ckfinder/userfiles/files/rimozatozetikugowejixenuz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/viderewixokewatuxu.pdfIn PDF document text
    • http://logicamail.it/draft/media/ludirelepixetelezinewu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/valalenojuge.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/94114563673.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/navil.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/24606156645.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/68349817859.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/81499598124.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0aae32711905a4c7e722a046915a2093/58426545187.pdfIn PDF document text
    • https://bor-diing.com/upload/files/daxarodemazaneleselegi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/xiwuwo.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/lunamulizifowaxiramaf.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jijidubazefaga.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/57680944593.pdfIn PDF document text
    • http://paradoxine.com/upload/files/tedozobuxare.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/46286654497.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/jesog.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79640929903.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/palozugeninodafuje.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/90313324484.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/8158811364.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/47195756191.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wotuvozifav.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109200021514816.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xonakuwotamebet.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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 10120 bytes
SHA-256: cbdf8eba705190f4d5f5ada36552d78f2d7be3761a63ac66a57ca56caf3796ef
font_01_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 17464 bytes
SHA-256: c3c48af3c49d422579f33d074eb1c0f4165f94431e28d5ebc43697b7d67bd4e6
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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