Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04dd73e6c168f58…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 01:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a75e7f72d416b85126137def8dde51db SHA-1: bf80bcb3c69ba04c20afc181ad5ec37c6b9e6e5c SHA-256: a04dd73e6c168f580f8d558c4e9e5e5146bbb508a06811252f60c8d54545e9dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a tactic to obscure the true malicious destination.

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://impressivetravelvietnam.com/upload/files/kopajagovoluwixered.pdf In PDF document text
    • https://simorgh.it/uploads/file/52194610677.pdfIn PDF document text
    • http://hbaoge.com/upload/files/xufoniloxazojiwa.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/33968168133.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/pagutozajosekale.pdfIn PDF document text
    • http://turatabor.hu/media/vokopanolofatafivijow.pdfIn PDF document text
    • http://rurisnet.org/images/file/98864729216.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/lokox.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sesakivarexopifipojorog.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/vedolon.pdfIn PDF document text
    • https://el-tall.pl/pics/file/83465889711.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/24984213562.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/baxotewivoge.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/muturaxikadupulijiguzujib.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e9e9bb4462e0596a80e382c9c96e6e5b/8636987229.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kakojavufutumepazitu.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/75444539345.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/darudonab.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/masamibonotuxifafuguk.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/felumodadumikalivofafoka.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40520171662.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210914094521.pdfIn PDF document text
    • http://space-edge.com/upload/files/72150588340.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/kebatu.pdfIn PDF document text
    • https://agatanorek.com/files/file/mujulavuronezexokag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pocket+bhagavad+gita+pdfPDF 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_off0000b62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 19004 bytes
SHA-256: 576695bc26974572c01b2765dbd155b11e42a040fa9dfc072b7b3624f4db93c6
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10780 bytes
SHA-256: 7ae623ce0dea8aa3fd711ca7963326e46b4fe501f169b84f835d8a15317884d6

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