Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb2804d6b3cc7b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 18:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d4a9a5ff2990a95601b7a2fc39390c4 SHA-1: e4e7e68c92b8bc188e136a1b89b97d2fc0ef41eb SHA-256: cffb2804d6b3cc7b3dcb7fcdee332c98d36ed7193da95db8101c12c88c24668b
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to `https://golowaki.ru/123?utm_term=id+card+template+free++word`, which is likely part of the malicious workflow. The document body, though heavily obfuscated, suggests a lure related to 'ID card template free word'. No scripts were extracted, but the presence of external URIs and the ML/ClamAV detections strongly suggest a malicious intent to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=id+card+template+free++word
    • https://cdn-cms.f-static.net/uploads/4371800/normal_600a1c7dab3ff.pdf
    • https://cdn.sqhk.co/vilitemeru/fwhdPjg/nosanurepumogikusosemofuj.pdf
    • https://cdn.sqhk.co/nobixapo/9hfPJgf/emergency_pyar_ringtone_download.pdf
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fdf10b3bfc7a.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fd8e69c23b2e.pdf
    • https://cdn.sqhk.co/kosifodalab/idLtSJE/get_lucky_movie_soundtrack.pdf
    • http://lalikexitaxixix.getenjoyment.net/comparative_superlative_games.pdf
    • http://molefomisapeput.mypressonline.com/38309293395.pdf
    • http://pekefosijemibi.sportsontheweb.net/lumbar_spondylolisthesis.pdf
    • http://kavelizopepi.mywebcommunity.org/33605479146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59bc393a-651d-4b67-8695-f6a183c5ea73/pifudosizoken.pdf
    • http://rexefobixavater.myartsonline.com/dazutakazopagulunuto.pdf
    • https://s3.amazonaws.com/juzewojavomofew/html_form_disable_submit_button.pdf
    • http://tikeresepujel.onlinewebshop.net/d-link_wireless_network_camera_dcs-930l_setup.pdf
    • https://uploads.strikinglycdn.com/files/e63d964b-91e2-4b8f-9226-7300bfde6778/how_to_use_schumacher_instant_power_battery_charger.pdf
    • https://s3.amazonaws.com/fajeloninesitel/king_kt76a_transponder_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/ff28678c-c179-4de4-868b-67002561832f/monosag.pdf
    • https://s3.amazonaws.com/rupatojuko/79858924204.pdf
    • https://uploads.strikinglycdn.com/files/760c7c63-f9b9-4109-b713-c89fed5b20bc/plantronics_wireless_headset_pairing.pdf
    • https://s3.amazonaws.com/ruzumeb/41174532225.pdf
    • https://s3.amazonaws.com/baposivarabuj/dj_aditya_name_ringtone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f278.bin
b3c05127da9b3aac4a52eb55a831afe0641a4c3115105eea644b2edd12eeddf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 5152 bytes
font_01_sfnt_off000103fd.bin
c40a18d472d8a6867b2d15983af42f0ba1837f51999e2d2353d0dc95ef7a5c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10956 bytes

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