Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fbabcbc7da78f2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 68da344b598f8fc413cc14f65f9a9572 SHA-1: 4a5babbb89e0de3db907c981221c186aa2aafd10 SHA-256: f8fbabcbc7da78f245fc098cefbdadf209b51f5b535911ea6497364991e8e0f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=find+sum+of+terms+in+arithmetic+sequence PDF link annotation
    • https://bnbcostaverde.it/userfiles/file/xekametigopebokexupuvatib.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/64209618895.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210901_FE6846A405C167BB.pdfIn PDF document text
    • https://betsin.org/userfiles/files/jenajetikijifefigidexi.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/segapasezovat.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/66318285925.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/17844946830.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/karepitop.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/22428252218.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3cd93677---67902358634.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219764770763.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/gotufabazisofizo.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xujapufezezubilipovirun.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mafajojevigajivob.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/29175662505.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/44646761519.pdfIn PDF document text
    • http://ccshecea.org/upload/files/29373844407.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21282067904.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/53491203428.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/11726533178.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/54684989387.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2aea948cbd474763c85a074d09e0d61d/43488049781.pdfIn PDF document text
    • http://canoeing.by/pics/files/22899224922.pdfIn PDF document text
    • https://cargotavio.ru/files/file/vowanabexepuxikowame.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_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 10920 bytes
SHA-256: d2bfbaf6d2d1809b3dc24a3a4723e95b007f04330edcd74c023a475ce9a76f00
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 15988 bytes
SHA-256: 2f741268aa9d6e049c5fd57c4cecfb29537aa0d38a966a7e5ff10ac187cf3801
font_02_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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