Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1c162b577239c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 15:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6543787c953a48bd644bac739f30d17 SHA-1: 50b60d121e70dd04dc0b77fc549c28a8f0e35bde SHA-256: 85c1c162b577239c1dd9f0d36731a37151ca0d86b77f428017cdfcd08ecf4d72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests the document's primary purpose is to host a large number of external links, likely to manipulate search engine results or direct users to malicious sites. The embedded URLs, such as 'https://golowaki.ru/123?utm_term=birthday+cake+pop+up+card+template+pdf', are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=birthday+cake+pop+up+card+template+pdf
    • https://cdn.sqhk.co/saxuxaka/r54Otie/gacha_life_super_funny_videos.pdf
    • https://cdn.sqhk.co/wemorapi/e2aIWm4/android_radio_nova_launcher_apk.pdf
    • https://cdn.sqhk.co/marixefe/hbighcH/6291268421.pdf
    • http://pimifawimonidij.mywebcommunity.org/vepogonopafegone.pdf
    • https://cdn.sqhk.co/gujowaxexag/Pig4bgd/simulator_argentina_2.pdf
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/8822687.pdf
    • http://jabudapitu.scienceontheweb.net/zoe_happy_fit_guide_free.pdf
    • https://cdn.sqhk.co/zivuronufepu/ijfufhj/murikajozezufi.pdf
    • https://cdn.sqhk.co/kasesiseb/tTIjcM0/remix_songs_download_telugu_naa.pdf
    • https://cdn.sqhk.co/senosekagoko/dWjeQ65/how_do_you_update_software_on_lg_tv.pdf
    • https://cdn.sqhk.co/borefigux/hdCgeHj/coffin_dance_meme_song_id_for_roblox.pdf
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/raxokewijevoxu.pdf
    • https://cdn.sqhk.co/lokabawopup/icXggib/dragon_hunter_orchestra_cello.pdf
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/nuvubov_lawep_kogekosozarix_besapifazuwe.pdf
    • http://kafofal.mygamesonline.org/jawbone_up3_app_store.pdf
    • https://cdn.sqhk.co/bisidilit/5hcjhcz/96207460818.pdf
    • https://cdn.sqhk.co/nukusigemug/ihhgcgW/fedononufomowiwilunuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_80b750bd906c4b74a21ca0d162ac2ba7.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_39d7a23cf0ad4b1f9615bdbfcbc93160.pdf?index=true
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_99a89a35c0774c1cbb40ba7e8ce0b55a.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_e9b102fbee3540d390057771a613f6fd.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_d4da5ebd9951405091acacb0668b00af.pdf?index=true
    • 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_off0000eff5.bin
fe45932121d466aeef34a6820991b40589e4db45ffd749ad38b003fd821e2d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 5432 bytes
font_01_sfnt_off00010255.bin
31b31fd499fbc2ab5edb656e3c241c518ab15f43eaff65734ffca6c22f2c7857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10080 bytes

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