Malicious PDF — malware analysis report

Static analysis result for SHA-256 a109ec4c34f7fb57…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 10:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1e577d561e5dda2435e7612d124d70d SHA-1: 55b28b4c698f3d4fac56a5144399dba9e7bd4f38 SHA-256: a109ec4c34f7fb57784fdafd567675817cfca2f00db31ab9b2eb5b6af4b884c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the overall detection suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hobbypet.cz/files/file/79519742711.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/22335069546.pdf
    • http://etenindex.nl/images/uploads/dekifagobijolesom.pdf
    • http://startmatbaa.com/userfiles/file/19760031313.pdf
    • http://md-servicios.com/userfiles/file/84579368971.pdf
    • http://alexdisinfestazioni.com/userfiles/files/weteru.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18d3531036281898e1fd80b059aff968/kimid.pdf
    • http://stavo-bazar.cz/userfiles/file/vosavekafetufivebezesaf.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/67b933a483bbc854c6dcacbd18a6fd54/potimabexoxotuminexudame.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/25068076405.pdf
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdf
    • https://junona.manyel.website/images/uploads/medium/39172007918.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/99553707464.pdf
    • http://agppi99.pretty-match.com/upload/files/wujigumoremoxawexibavov.pdf
    • http://sevenseahotel.com/uploads/images/files/rerifosabufilereguza.pdf
    • https://hoatuoi360.vn/uploads/files/3769262595.pdf
    • http://shoreluxurylimos.com/userfiles/files/52961979142.pdf
    • http://theorientgarden.iorderfoods.com/uploads/files/repodejewibepeli.pdf
    • https://stcc-sa.com/motakamel/Ups/files/58845584202.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/dexivozotekazu.pdf
    • http://abworder.com/uploads/files/vewugefejig.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/kejuwekixogotepamiluboxep.pdf
    • http://flooroverstock.com/admin/userfiles/file/23552365769.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=offline+android+farm+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef83.bin
c6f27a927ff325d85c597482f72254fb5d476e01f80e7ffe6651b879a6f0a0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10624 bytes
font_01_sfnt_off00010783.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16792 bytes
font_02_sfnt_off00011f95.bin
ba6cf3df3941626261c2623b0b58d06eec37523c32924986302ab18823c4adae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16484 bytes

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