Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a690584b1aa277…

MALICIOUS

PDF

67.2 KB Created: 2021-03-10 14:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80cce47cdbd91ebbdd506d5d42c85755 SHA-1: 7b90784610cf3dd3b21199fb1bd159d503b5fc7f SHA-256: a8a690584b1aa27749c2be42bd8c5da6abdfbcfa439fc5406113f42a30687c01
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or phishing lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=james+bastien+piano+books+pdf
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/b8ce02b3734a1.pdf
    • https://cdn.sqhk.co/rasepotobami/chgFgie/e_coli_prevention.pdf
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/4363290.pdf
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/cb1a912.pdf
    • https://cdn.sqhk.co/xagaxubibiz/fts8pij/15237677021.pdf
    • https://cdn.sqhk.co/pefisemise/heTS3oz/color_thermal_label_maker.pdf
    • https://riledamulobav.weebly.com/uploads/1/3/0/9/130969772/dodorujitav.pdf
    • http://chaptejvxz.fun/wufudikq8tpl.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/740b8a5.pdf
    • http://hamsterbig.com/89678241269os0hu.pdf
    • http://pe50off.info/53168919595erf32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_34e53b98bde24f0e82fd3c4e96595d30.pdf?index=true
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_bf7ca3a822ab4dc0aabf28744af9cc0f.pdf?index=true
    • http://pusapovewazigu.onlinewebshop.net/click_clack_moo_cows_that_type_reading_comprehension_questions.pdf
    • https://s3.amazonaws.com/xelimewat/el_desafio_del_amor_libro_precio.pdf
    • http://futakanawus.onlinewebshop.net/12386358214.pdf
    • https://s3.amazonaws.com/gorajikunobixi/58876937032.pdf
    • https://s3.amazonaws.com/mejados/52184634965.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_off0000c939.bin
6b8b8e97bff5f836950300c5bc09449b4f7a5879554cb9c6c7b5dcb4fde738b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 5252 bytes
font_01_sfnt_off0000db0b.bin
32fb0cec8b6507c902959f1d9ced43db3975560f86f311a64c2970f20ba12e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10476 bytes

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