Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c88b366d7ec93…

MALICIOUS

PDF

76.1 KB Created: 2021-02-25 14:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 78a7df940f79e82cc4d5e51ed30f4096 SHA-1: 93cef09af99b700647f9016b78a8ae4651773276 SHA-256: 856c88b366d7ec9321763d1e86d9592e59d17260c44ee1cc7f667c5f0d5b5629
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary lure being a download for 'juz amma full mp3 anak'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/award?keyword=download+juz+amma+full+mp3+anak PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/gopro_hero_4_silver_4k_30fps.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/1243737.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/0Kvvzge/xetabosuzinapenotodirid.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/gJfupic/zombie_blast_crew.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/c9693.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/iijWifx/bajobopinikovaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455387/normal_60064aa307673.pdfIn PDF document text
    • http://spiritstudio.ru/altec_lansing_life_jacket_2_vs_jbl_charge_3rbfz3.pdfIn PDF document text
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/8783263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/piano_sheet_music_easy_free_popular_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/game_minecraft_gratis_versi_lama.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/xitoxipixetuwovur.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/24261431346.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/71294838132.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 5356 bytes
SHA-256: 50259ca08bf9cd8967e610e74e132f49ddbf9a97e47c38069150968cf7b340d2
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10172 bytes
SHA-256: 393bc8e30b6b7a33ea0d4df3f028632103e66faffc8e4159f9b477c285b7560f
font_02_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 18620 bytes
SHA-256: 8d59083c68dd1228190045cb256952c2b65f7b612c16e352f1ebee5013b9bc60

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