Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b7b9d804aeeddb…

MALICIOUS

PDF

75.4 KB Created: 2021-02-21 15:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 54d27d1f863e2bcc81f24dc84efc0fbe SHA-1: 8c6f853f2037c651ddaf00f6a0e7e6a35ecddb26 SHA-256: c8b7b9d804aeeddb835fcbf57959784e9ce61ef252a31ac904a776861e91ceff
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=scribblenauts+unlimited+apk+download PDF link annotation
    • https://cdn.sqhk.co/nananava/gdhdhi1/koaa_news_5_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/zowegifivufo/bZhhcia/28396449017.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/pjhCenh/kumubelilibukemupiko.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/new_apft_run_standards.pdfIn PDF document text
    • http://kipupera.22web.org/45532999623.pdfIn PDF document text
    • http://barashik.space/transfer_case_fluid_colorb0r48.pdfIn PDF document text
    • http://fishland.store/kiraxupidetujuvufutekov27l5w.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/desifibeku02l.pdfIn PDF document text
    • http://fito4ka.xyz/95363418461wlfto.pdfIn PDF document text
    • http://promooffer.site/xanonapigidirelanuxedsma2x.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/ibehjOm/32819182705.pdfIn PDF document text
    • http://emmetrix.net/fokonejawafixidajitogebeofqnv.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/nggjeje/duck_hunt_nintendo_game_value.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitediwufekoxem.epizy.com/phenol_chloroform_isoamyl_alcohol_dna_purification.pdfIn PDF document text
    • http://kexeban.rf.gd/basic_computer_knowledge.pdfIn PDF document text
    • http://wotimadugol.epizy.com/71780558098.pdfIn PDF document text
    • http://kupavojos.epizy.com/salesforce_workbench_date_format.pdfIn PDF document text
    • http://nivewurunowu.rf.gd/minecraft_map_maker.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5616 bytes
SHA-256: 1d1a1b0f7c21dea7e4f167ca5f27fb54801bd425bbbb5944559f6e2873c23b11
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10224 bytes
SHA-256: 23ce809519590f8d95883fcc5f858f21c5dc8e3ea6a441b65f9e6cd21b24220c

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