Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2fa71ea7fc2caf…

MALICIOUS

PDF

88.5 KB Created: 2021-03-19 23:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7db613e2317155943940205a2eb6fb80 SHA-1: de7b3ad5a9258b386f3650c8a9b536023025f8f4 SHA-256: 8c2fa71ea7fc2cafb1398b8f137b78ddfc4da7c3c6c826868e2e488ffc2575eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/123?utm_term=love+calculator+apps++for+mobile
    • https://cdn.sqhk.co/kizafizutuw/igWKjhg/83350770929.pdf
    • https://cdn.sqhk.co/dugudumopup/fWsjhew/pappu_cartoon_video_mein.pdf
    • https://cdn.sqhk.co/xokekekav/8jdg913/aicpa_membership_renewal_form.pdf
    • https://cdn.sqhk.co/xisofofumew/aif7I4J/xudunidosav.pdf
    • https://cdn.sqhk.co/sutazojawote/gGtiatL/press_to_push_app.pdf
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/dcf23e3f1c87.pdf
    • https://cdn.sqhk.co/wolowivem/hjgihfK/catfish_near_me_irving_tx.pdf
    • https://cdn.sqhk.co/tokafumotebi/ihfkjc0/kogarasizejopawujaradu.pdf
    • https://cdn.sqhk.co/jadilogivusa/dhahgaS/baby_sinhala_song.pdf
    • https://monoxute.weebly.com/uploads/1/3/6/0/136051008/lopegapezif_vajanul_kajujiba_tedofib.pdf
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/jetinubagunebem_lurifusu_luzopup.pdf
    • https://cdn.sqhk.co/xaduwudixum/hapobYg/secrets_game_of_choices_mod_apk_sbenny.pdf
    • https://cdn.sqhk.co/jivazufevi/gujgYgj/w3schools_javascript_object_methods.pdf
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/4c6fe.pdf
    • https://cdn.sqhk.co/deloreba/iiojeLa/85359722880.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/3393309.pdf
    • https://cdn.sqhk.co/jiguluzufuwa/uuihRjh/vufarejakero.pdf
    • https://cdn.sqhk.co/lisakopew/jbha0gf/download_ninja_blade_pc_game_highly_compressed.pdf
    • https://cdn.sqhk.co/batitiviz/8hs8gjC/battery_powered_lights_for_closet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_46907adec5f748fd893a43be133ec7a6.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_194b047df30c4556b96219a8a7dae622.pdf?index=true
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_dc38a962df164caba4cb04d27b3cd164.pdf?index=true
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_c5ba1f4c95664119994750702742cf76.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fce.bin
7bd63a067d650d260c0c71dbfc94c89d9d7784297b8e5a4ad3b43d674beb9a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 5080 bytes
font_01_sfnt_off00012121.bin
87acdbd820d7ceb88e2ab0353047d3d1738f99f90670660484e8f4f38deea550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 10920 bytes
font_02_sfnt_off00014689.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 4324 bytes

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