Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51f1b5893e5d8dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-27 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd52c520f591e24cb7b62a8be86b69b SHA-1: 48ecafdbb6ca46245f3b705c8c9962bbb135f9d0 SHA-256: a51f1b5893e5d8dcfe2b315e07469015aafe5de03ed3ef0c196e92fcaa6939a5
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to suspicious PDF files, and one heuristic specifically identified it as a link farm on disposable hosting. This suggests the primary purpose is to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://yeosingol.com/FileData/ckfinder/files/20210921_32947292C0CAF521.pdf
    • https://ljlconst.com/admin/images/file/61015990692.pdf
    • http://ducnhua.com/upload/files/dirowuwitokokaloxilogu.pdf
    • http://finance-bulldog.cz/UserFiles/File/nesiwevopidu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/92cb7f343b080ae2e70d8b3aef080266/gobasolaxiwupivigilure.pdf
    • http://aceonlinementors.com/userfiles/file/mubuveleluf.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/kazuzaximiveteripekujilad.pdf
    • https://raljob.com/userfiles/file/97891970862.pdf
    • http://apexnepaltravel.com/userfiles/file/gewududisalejavuxeguwedez.pdf
    • https://minhkygroup.com/luutru/files/10607940898.pdf
    • http://short-story.ru/upload/file/33998094098.pdf
    • http://divelife.kz/files/file/94619138116.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/sarasiruge.pdf
    • https://alariel.be/userfiles/file/61776607345.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/16428486472.pdf
    • https://mollis.rs/files/57165993135.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631878402_58937734d4.pdf
    • http://sinproval.it/userfiles/files/40761396685.pdf
    • https://zilalcooling.com/other_files/File/mukibejuwegiropobapuw.pdf
    • http://gaytonfa.com/upload/files/44848379440.pdf
    • http://gniortho.com/files/Upload/file/91243155783.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ed2a6950---56491511462.pdf
    • http://plncse.hu/php_data/file/6932579601.pdf
    • https://sarenpinler.com/calisma2/files/uploads/dabisizawalebetiziwudim.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/tapexuvejekizazazu.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/xezaruzusogi.pdf
    • http://vector-mebel.ru/uploads/files/seruramoxuvi.pdf
    • http://sadiqandsons.com/userfiles/files/folunumokixenojetagew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=star+idol+animated+3d+avatar+mod+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000103b1.bin
3b22649405bd7033eb78591bba0b248fc2a445789774df2b8abd9b9e98a094fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103B1 18140 bytes
font_00_sfnt_off0000bc29.bin
b7023faecf92d0daf7344260ed9cf75630cc7e9c7b95d4c7e2ec87b987bd4a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC29 10788 bytes
font_01_sfnt_off0000d4f9.bin
ea48fdc8e867970281fdbc0024da35fe115ad5ffa6669408348c6ffe80b10f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 18156 bytes
font_03_sfnt_off00011fe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes

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