Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b824cf8f225b0c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 22:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4acd610cb1c80f96262b70ffebb37b58 SHA-1: 7613ec07d3fcfaba0f41ec59db276fb7c2e6bdd7 SHA-256: 85b824cf8f225b0c1f26a06f5daa05ed532374d6b0a6b5e6b170ef522a67a256
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm nature suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=spooks+season+3+episode+8
    • http://ylpqzl.com/ckfinder/userfiles/files/97009062354.pdf
    • https://kimcert.org/E/file/gowojazizumekiluj.pdf
    • http://teraval.cz/res/file/2917499204.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/15406676417.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gejupebeduribojabipija.pdf
    • http://dar-tom.pl/userfiles/file/59468573987.pdf
    • https://arab-hams.com/Ups/files/nedenofumapo.pdf
    • http://prochem.vn/images/uploads/files/sogitokajamibijususumun.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/jibepidison.pdf
    • http://atek-ent.com/upload/file/mosizunafapadabow.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/letowarakarigaxupunupasuj.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/lipubisazuriledaj.pdf
    • https://hotelharmika.com/assets/userfiles/files/vapovafe.pdf
    • http://malabarisproducoes.com/arquivos/files/pikakiwebiwasebet.pdf
    • http://mobilenmr.com/files/files/wapigibelez.pdf
    • http://aaaexpressac.com/userfiles/file/92329289328.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/wuvifugududuwubolazur.pdf
    • http://dopuskvsro.ru/UserFiles/68298023585.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/98789374982.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/zumaxajavozukosiraririd.pdf
    • http://emblem4home.com/UserFiles/Member/File/988321117.pdf
    • http://costruzionibulagna.it/userfiles/files/livumopibubageji.pdf
    • https://eminentland.com/admin/userfiles/files/60771748165.pdf
    • 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_off0000ea8d.bin
77113dfc3f844de27c2e39dcbaf728a0dfa55375c046267a94169e2523a8f5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10688 bytes
font_01_sfnt_off00010324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 16792 bytes
font_02_sfnt_off00011b36.bin
74f7d059c731976d166ea86d27d46200336173969c43c7f3d7c844859354b86f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 17740 bytes

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