Malicious PDF — malware analysis report

Static analysis result for SHA-256 277547a684ed9fc9…

MALICIOUS

PDF

74.2 KB Created: 2021-04-01 09:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0e83b0dbf7c208fcda339fc1e0e95aa SHA-1: ef4206c33379a632e77540ba86cdd48a74bb091d SHA-256: 277547a684ed9fc9e991f8562005a670ac19632314860e112127ab787a269d7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'Hallelujah chorus staff pdf' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous external URIs, many pointing to disposable domains, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=hallelujah+chorus+staff+pdf PDF link annotation
    • https://cdn.sqhk.co/jovowosifo/jlOUnrF/tiny_bubbles_song.pdfIn PDF document text
    • http://ig-socialmedia.xyz/datuwolof7lsqi.pdfIn PDF document text
    • http://arendagg.xyz/5120393803zqlef.pdfIn PDF document text
    • https://cdn.sqhk.co/sijaxovada/jNFExgM/xiwodanesuruvozidaguwatep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6044cc655bcb2.pdfIn PDF document text
    • http://opt15.ru/how_do_you_troubleshoot_home_thermostats_workyn9tj.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hegdCkG/17630933288.pdfIn PDF document text
    • http://douchehq.xyz/gurizolemekizi2sw8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_60593ed5ee8e3.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/fjhjjBP/bubererojapazuduloludaki.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/RhanKQh/18999666167.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Kig1phe/10054695309.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/hjjryig/best_camera_for_android_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_6064455258391.pdfIn PDF document text
    • http://rocketdocs.us/i_ready_quiz_answers_level_d_readingi7oli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5ffbd725bc7c4.pdfIn PDF document text
    • http://xatitakuv.iblogger.org/mivawetizowukoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapexer.rf.gd/the_science_book_big_ideas_simply_explained.pdfIn PDF document text
    • http://naxogifesos.rf.gd/cash_flow_forecasting_techniques.pdfIn PDF document text
    • http://wiwedekepumepup.epizy.com/cancer_de_cervix_estadios.pdfIn PDF document text
    • http://wewiligeva.epizy.com/lurigul.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_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 5280 bytes
SHA-256: 793d7af0b85372883af019e8fab512491ba1ff54f157500bee7fdcadf669cbd6
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10736 bytes
SHA-256: a55d49de12e79bb9a7e28658409bccf3eb5aa99bdf54eb08d2117bc8b4656e0e

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