Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d287b1c6aa9e10a…

MALICIOUS

PDF

166.3 KB Created: 2021-04-05 09:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7985897a24120306fdc8173058e748ca SHA-1: 194157d081f60ccb0437dc1b4c8d595280179682 SHA-256: 1d287b1c6aa9e10ad72d17397866bd3a7d8c4514f74b844ac801de0afe882601
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nipisod.ru/123?utm_term=dba+tecnologia+e+informatica+2018 PDF link annotation
    • http://lamejix.scienceontheweb.net/fosafa.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/mastoiditis_pediatria.pdfIn PDF document text
    • http://remastacer.com/xukabafo4pkna.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/iicNbgh/free_dragonfly_illustration.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/hcZLibE/commander_in_chief_examples_bush.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/lawoxibebiboweuvssc.pdfIn PDF document text
    • http://torgservis-rus.ru/axon_7_mini_updatevuku9.pdfIn PDF document text
    • http://chambrehq.xyz/nileruzulerugapqj8zu.pdfIn PDF document text
    • http://virnet77.ru/monster_truck_hill_climb_drive_offroad_gamesel5k4.pdfIn PDF document text
    • http://50offshop.info/4404016668ek8v1.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/hedmQhb/qa_test_report_sample.pdfIn PDF document text
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/taxitin.pdfIn PDF document text
    • http://bigops.fun/framed_impact_20_bmx_bike_silvern9ki2.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/giiazhe/nenupepeladatoxelaxoj.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/firizafipalonabixo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_93c2882f9c7847a7b4f1265a5b11aeb8.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_b4b1a919d32b4cc4a17d0894a91a1252.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_3477ac6aac3e460b87c288d38655ae76.pdf?index=trueIn PDF document text
    • http://feferabi.atwebpages.com/tezolubaxamojofuwaputi.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_9e216f2ce33341d095880ce27d7bd8e1.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_b5801b76dabb44769aca311c376a62d1.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2381E 1572 bytes
SHA-256: 86fea18fcca4af12b6451a3a7d82bf074c2f69e1994e916b264d01de7f8ea443
font_01_sfnt_off00024020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24020 5472 bytes
SHA-256: cc61f421f175f17c0a381fc6dff5d5bb860efade5fbd39389732812b796d9889
font_02_sfnt_off000252a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252A1 12480 bytes
SHA-256: 54a10bf57116d571e0886bdff259e7d54aa8e7ef33c797d924aba61e5bb97eb7
font_03_sfnt_off00027a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A67 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176