Malicious PDF — malware analysis report

Static analysis result for SHA-256 056aca8e43ce7912…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 20:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f015bf075a9b63ed5471195ffe9e9a86 SHA-1: ebf5b97139ae0bd8aba5da9161bffe79b43ca37c SHA-256: 056aca8e43ce79120b5808a942db8b8968dc4fbbfa8ffdbd6f794350386e0d18
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to 'advent candle colors' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+meaning+of+advent+candle+colors
    • http://cybety.xyz/union_budget_2019-20_download_upscoxdao.pdf
    • http://igclienteam.com/dejakusuxafajugafaseto9uoj7.pdf
    • http://gprofights.ru/zufizelon785z.pdf
    • https://cdn.sqhk.co/vavuvalegel/jgg4xJc/rudaxetetogem.pdf
    • http://organic100.fun/cara_backup_whatsapp_android_to_iphone558zz.pdf
    • http://naturalgood.space/3536475798045g1z.pdf
    • http://gatorama.space/19000637014luenb.pdf
    • https://cdn.sqhk.co/rivitovolu/bihhfhe/earthquake_california_friday_night.pdf
    • http://remont-pc.website/breezin_thru_theory_answer_key_chapter_1atup0.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • http://solent.bar/gavidetinaxilwecb.pdf
    • https://cdn.sqhk.co/rorajakura/fjbreSI/plumbing_pipe_connection_types.pdf
    • https://cdn.sqhk.co/vabadoma/2TjcijH/wumavumimilifelarovu.pdf
    • http://magazok.top/27832041541gzh36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_fb720f98889841d0b76afeb78d1e3978.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_fecaa170268d4377bac76d200610f752.pdf?index=true
    • https://s3.amazonaws.com/fuwawibu/horizontal_scroll_menu_android.pdf
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_b0fb7f3aabf2447b9a7890087a855c53.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_960a732debb742879b58e0ac885b4f9d.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/89943653959.pdf
    • https://s3.amazonaws.com/vavabi/framingham_score_sheet.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_off0000f356.bin
7bea22a051fccd53c56de932348a342e4d62754d70efeb0e94c265ea52558c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 5508 bytes
font_01_sfnt_off000105fc.bin
2bfa41a0bc6c0e1ad9f15868baaf29f9f6936de04c1a858cb23e2018ce4f8ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 11048 bytes

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