Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c6cd0d5c53fe5b…

MALICIOUS

PDF

77.3 KB Created: 2021-04-10 07:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4dd610e0679802cb42819d30a5c51899 SHA-1: d9c20a7efea9afc06e406f01eb4cf4545af9ea66 SHA-256: e8c6cd0d5c53fe5b5fbf9b6988a762244cd4fbc41b982977503e2a60278c7045
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a non-clustered link farm on disposable hosting, likely to distribute malware or conduct phishing. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=ships+dungeons+and+dragons+5e+character+sheet+pdf PDF link annotation
    • http://sevastopol.sale/61005111875qu4g0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_60450a7faefbe.pdfIn PDF document text
    • http://kellys.space/468582185622sf63.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ie6NKig/rocketbook_app_for_chromebook.pdfIn PDF document text
    • http://openplafond.xyz/kagapa307ki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff9af6713d0b.pdfIn PDF document text
    • http://iqecoportal.ru/poki_and_fedmj5mw.pdfIn PDF document text
    • http://gravkamen.ru/95054216622e6szb.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/ijghbji/33774926962.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/CgjjuAc/soccer_championship-_free_kicks.pdfIn PDF document text
    • http://meetdouche.xyz/7372959989893fai.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/c1nG6jd/whatsapp_status_video_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/lhajfVm/screen_recorder_mac_free_no_watermark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_601dd347a1270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_600251e3cb4b7.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/jc86hcg/mukanufatar.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/pdf_book_reader_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/hiOjj5f/duck_game_2020_update.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalixonawi.atwebpages.com/topiveju.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 5612 bytes
SHA-256: 0d8c39aec668811879c2b60045a4251b33e7292128aeef6c4e74032ce27e4e37
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 11496 bytes
SHA-256: 2338e85f03e2877c87a4c7fa1c9f0598c0a3ed8454f184e82151185749bebc46

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