Malicious PDF — malware analysis report

Static analysis result for SHA-256 353ff27bba70c374…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 23:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1e7eaf4b1b6a391fed27c39507302fbe SHA-1: fca552fd56b41f92b8ced5a4d6686e4dc03ec19d SHA-256: 353ff27bba70c374d6a727043b823fe4c30dffeea6bfa1bf278b27a0a3d2a9e3
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of URLs like 'dafemum.ru' and 'cdn.sqhk.co' indicates attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

Heuristics 6

  • 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 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dafemum.ru/award?keyword=how+to+pair+iworld+wireless+headphones+sony PDF link annotation
    • https://cdn.sqhk.co/tumosirewuw/fZnwQmP/marble_run_toys_r_us_canada.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/samsung_8.5_kg_top_loader_washing_machine_reviews.pdfIn PDF document text
    • http://stavki.link/how_to_program_universal_remote_lm-1079vrqhj.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/jjjiSDK/zimamakiwut.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/zTijTrz/phoenix_zoo_lights_groupon.pdfIn PDF document text
    • http://goodik.fun/world_inbox_history_bookwz01h.pdfIn PDF document text
    • http://topuniversityru.fun/critical_care_paramedic_bookxd0qa.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/VgcDDgd/61299812657.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/gokomajalonegix.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/gjbggLO/battle_arena_toshinden_game_boy_cartouche.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/94468796378.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/CgiBTib/rock_paper_scissors_online_booking.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/Whb3idW/mma_manager_app_store.pdfIn PDF document text
    • http://grigolia-studio.ru/daytona_international_speedway_events_july_2019wwast.pdfIn PDF document text
    • http://italysummer.space/pexorugaxpil8m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukanebesiva.atwebpages.com/69379030132.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/wijokafozuzusa.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/how_do_i_start_a_pawn_business.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/how_to_use_casio_graphing_calculator_fx-9860gii.pdfIn 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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5200 bytes
SHA-256: 91dd26ae67fa03f7afccf363a8a89b985c10cf7b4226f561f6a70bc249e0cc86
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 10032 bytes
SHA-256: ab3fd10f09602cc2d53fdc518387908e3aed35126c41a1455e7483056dd6bcff

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