Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c1a398251d97a…

MALICIOUS

PDF

67.5 KB Created: 2021-01-28 20:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f431587478f256825b8b108ef46aba1 SHA-1: 56affceb33d30b10949bc4f75793d3ed94678f1b SHA-256: 7f1c1a398251d97a68e701359b1a6b208d2318d4bb73edca3bf46abe5914a4e6
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links. The document body, though partially corrupted, suggests a lure related to 'medication administration poster', likely a pretext to encourage users to click on the numerous embedded URLs. The presence of PDF_SEO_LINK_FARM and SE_CALLBACK_LURE heuristics indicates a strong likelihood of phishing or a link farm designed to distribute further malicious content or redirect users to scam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=5+rights+of+medication+administration+poster
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/5951228.pdf
    • http://ygrash.website/ocean_fortune_apkd8uak.pdf
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/3924424.pdf
    • http://vixurefivero.66ghz.com/18997158948.pdf
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/zokagiguzowusumow.pdf
    • https://cdn.sqhk.co/lirebirab/c2gdLfX/58908021394.pdf
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/f79994b1b.pdf
    • https://cdn.sqhk.co/vawikepaf/Kf6zgfQ/emergency_kit_food_list.pdf
    • http://senteber.site/choices_stories_you_play_pc_mod1tqek.pdf
    • https://cdn.sqhk.co/vigesiji/0Ugd7Ze/47091858577.pdf
    • https://cdn.sqhk.co/bomikiwolug/ighjbdt/xodofakogofanu.pdf
    • https://cdn.sqhk.co/pawijilabu/heBiiCg/mobile_phone_malayalam_ringtones_free_download.pdf
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/b6bb25.pdf
    • http://instasale.company/lizojiroruxanidejuwunuhasdw.pdf
    • https://judagurulo.weebly.com/uploads/1/3/1/4/131438873/fazesapowabeka.pdf
    • https://cdn.sqhk.co/pixazizaze/gciiahi/fakabexuk.pdf
    • https://cdn.sqhk.co/tinipuded/r9diaaw/49655059804.pdf
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/1871662.pdf
    • http://geleostone.online/realm_grinder_dwarf_artifact_setn6tno.pdf
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/123039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bawatusarab.epizy.com/bafowofaralagama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdce.bin
612d4a77017247f191220a2167a839efaaa4b9d18395af02e206673a1bc3b485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 5356 bytes
font_01_sfnt_off0000cfd7.bin
3c7793eb6d1af4e4a102b3b83ef09c41c04e6887ebd7653f71425a5e18a7b3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 10092 bytes
font_02_sfnt_off0000f222.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 4324 bytes

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