Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c86d5134e96d88…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 01:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f23908bd2854ffdd52e253059c600e3 SHA-1: ed54934fbd8f5310f8e67eea5c0aa8b0b9c49d80 SHA-256: b5c86d5134e96d88d499a8e577fc98b78a3ab6c112e249eedc546ea311667749
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a pretext to trick users into downloading and opening a password-protected archive, which is a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/award?keyword=split+and+merge+pdf+files+free+online PDF link annotation
    • http://wobafobigo.mywebcommunity.org/rain_bird_sprinkler_controller_installation.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/jokokalemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5feead0934ef9.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/cecil_textbook_of_medicine_free_download.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/abc_alphabet_chart.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/jofokej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_603b43969e004.pdfIn PDF document text
    • https://kogexabisuzim.weebly.com/uploads/1/3/4/3/134322867/3155551.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jjnfijX/tone_generator_application.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/best_wilderness_survival_tv_shows.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/igaifKv/bailey_and_love_archive._org.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/jbicwhd/3972703015.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/phonak_brio_3r-312t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_602d430c79776.pdfIn 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://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_5ee75408a4ad438a9740f71079956ad6.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_5fbd08fe721e470180e93dd8f20bbcd2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5252 bytes
SHA-256: 16154bbcd07ba7e53b904d0fefb1497c8792c1c8c6bedf76e4ca3e04018d3286
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10440 bytes
SHA-256: b96ad46d1bc0046efbb39a78d0485daf25c82861017068b0d4720c0e6e651700
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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