Malicious PDF — malware analysis report

Static analysis result for SHA-256 932d53130c1d4efd…

MALICIOUS

PDF

79.2 KB Created: 2021-04-11 17:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b444ae5925d01960f7f200d3338460a SHA-1: ddcca9b5d3a0cf62a6556f1f89cde730dc6d3bd7 SHA-256: 932d53130c1d4efdd4ece0f2fd7aa5be87caad34f504de8a30fb240985d5ca17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+is+final+inspection+in+construction
    • http://wabiferofuvud.mygamesonline.org/natupis.pdf
    • https://gijifapezikad.weebly.com/uploads/1/3/4/6/134644128/fejurogej.pdf
    • http://lipuwisapi.mywebcommunity.org/xonowemepo.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/tafanomozok_zatapinil.pdf
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/c76841.pdf
    • http://bugiwuxad.medianewsonline.com/tejekonuxeb.pdf
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/fc68af5a8e6925.pdf
    • http://mitedujonajezed.scienceontheweb.net/gosorutezurudirerukotenu.pdf
    • http://fofiwafajelerax.sportsontheweb.net/baby_girl_clothing_3-6_months.pdf
    • http://gazozasi.scienceontheweb.net/towarexirif.pdf
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/jifodu.pdf
    • http://biwedujurar.mywebcommunity.org/beginning_excel.pdf
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/8336698.pdf
    • http://sawedes.mywebcommunity.org/42204072676.pdf
    • http://vobafoselalulor.mypressonline.com/20448241928.pdf
    • https://romigugegis.weebly.com/uploads/1/3/1/3/131384185/lipixar_futomisuniji_wamomib.pdf
    • http://tulomodev.getenjoyment.net/71510308766.pdf
    • http://nunobuzipame.medianewsonline.com/balance_general_contabilidad.pdf
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/nemexisunag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://muvekalufisu.atwebpages.com/tejikoxasanexefilurudewus.pdf
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_3bb5a6761d174b78a26558846c336a6f.pdf?index=true
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_3f4e7d3d36da457bbdbdc81988852d55.pdf?index=true
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_d7e365ef5010417da1d601dc5fcdc3bf.pdf?index=true
    • http://fepetixapokurob.myartsonline.com/intermediate_algebra_problems_with_solutions.pdf
    • http://nununad.myartsonline.com/black_and_decker_drip_coffee_maker_with_grinder.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e979.bin
6b829c726b4cd9dca23e558cb66062a15bb576c9928a53a40bd646f004be4c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 4996 bytes
font_01_sfnt_off0000fa74.bin
e452dc0c739cbe8b7126cd8b2e4fe44eb6587eaa9aac3a8d2c2333cb5300ea5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 11308 bytes
font_02_sfnt_off000120df.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 4324 bytes

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