Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d9e80b9688c62…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 08:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c05e993c6d81a8b5cf9731780ff1c78 SHA-1: d2a119a1cc47219f2a76a1cb2778b5ba20376317 SHA-256: a39d9e80b9688c62fb366b493c4e06e1c017c6817e2206e0f2e60722e5aecc6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The embedded URLs point to suspicious domains, and the file's structure and content are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+do+i+manually+update+apps+on+android PDF link annotation
    • http://giorgimpianti.com/userfiles/file/jakelomuvakesokaguno.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pilojinaseragotujo.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/70792242410.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/zumafogudatedi.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/3327680877.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mipapaxagevupixeb.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/23314093622.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kizoxusetuxifosamudusi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87570038827.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/galowatomuv.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/velukositisenujera.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/85801590283.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/59947790406.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/votoditemavinef.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/sabagebimabeviri.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/50671402671.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091005045073499.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/musapeso.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/82496842286.pdfIn PDF document text
    • https://red-adlay.com/upload/files/11020720750.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/77f1c66efe7144738f67565c8ff954fc/45991220185.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jikevosi.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/zuwuza.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10844 bytes
SHA-256: bf42d9efbeee96c9c0459d2899b833175f333ded63c8aa1fe4c040e9be27feda
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 17932 bytes
SHA-256: 877f5e3f4260558a87fbca05e8b2d2ddb1192cee5923b3265040b234b9c32916

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