Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c677dd017dae1c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 702243126d74266e716ea216f1d8bde5 SHA-1: 7e25cf617eaf50b7eb6399346b66684deccf83a8 SHA-256: 20c677dd017dae1c96c884de07d8a85697a971228de70ffc9a61188a4188c837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=modelo+de+florence+nightingale+pdf PDF link annotation
    • http://kxzyjy.com/CKEdit/upload/files/lexajaguj.pdfIn PDF document text
    • https://activepymes.com/pub/file/sipulexukazareb.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/funez.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916033325.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fodolazate.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/guwabizap.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/32900428725.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/307006901.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/1803069307.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355be630557---pojog.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/16513520767.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/96757274825.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/vebotozivetena.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/13527892318.pdfIn PDF document text
    • https://nexusmediation.nl/files/vivemopemado.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/67173764480.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/kesedev.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/gakotazo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/6747483759.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/32762554064.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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 18232 bytes
SHA-256: d107f0ea6c9f0d94197e01441493961a12f8152a98a7f5b1b22c7d7de27e633a
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 10724 bytes
SHA-256: c58683431205ab8e29e3df4390edd5f304b29a0a9d94ad7044642d470c3b6295

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