Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f03deed3bdf57f5…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 00:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68cb8179f5a889a1e616ce7c0a92e236 SHA-1: 4dc33ad7507ca4d656968a6ecd30837e4207582b SHA-256: 5f03deed3bdf57f5e23950e7bb680a066447bcedf2f00fcebddb4a34e5bdb321
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of a URL disguised as a download for 'gta 3 android' suggests a phishing or malware distribution lure, aligning with the 'Pdf.Phishing.Trojan' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://moderncarrent.com/user_img/files/taremosatuzerobar.pdf In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/20344113413.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109071350393760.pdfIn PDF document text
    • http://gr-chem.com/upload/files/52647999473.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/lojuzuda.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fokinivugasofogozupugev.pdfIn PDF document text
    • http://riviera.az/userfiles/file/bumal.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/22284870293.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614560d5d0043---livikilozilunufiwi.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/mipepuwinozebiw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161401fcbd8e6b---sodosavinazekibanukutidu.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/99141630657.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/46367004076.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xazabafimuzawinimisuv.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/gowufoverutozatabe.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kolugitetapekixixo.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/31181746452.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/98591310568.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/33436885898.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/geruturujura.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/16187178115.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/gutibojax.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kegoseborajifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+3+android+1PDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10160 bytes
SHA-256: c9cd1141a8a8a11ffe95de21a4ed54901437e7f135e021b910839a647780fc3e
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 17380 bytes
SHA-256: c3fd801491f00852f7cedb4f84f78adc9119b65607d0bf539cf10ead16ffa222

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