Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafedb307333f3a0…

MALICIOUS

PDF

127.1 KB Created: 2021-03-18 13:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7eb3d75c65b91fd075ff3a3b9df6e382 SHA-1: 4bfdf27ae3567b9dd432d8dcc874877df10b6b75 SHA-256: dafedb307333f3a09e2bcf357cf1cea1db3ecfb0d0263408dc0104bb4ff5e6b3
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple external URIs and the link farm heuristic strongly indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=is+cinderella+based+on+a+real+story PDF link annotation
    • http://nickned.me/20496603346beo62.pdfIn PDF document text
    • http://healthytrands.com/what_are_the_3_kinds_of_texture_in_music8eflg.pdfIn PDF document text
    • http://svoylend.xyz/the_uglies_book_sparknotesvjxuq.pdfIn PDF document text
    • http://jobware.pro/795705655398tfjn.pdfIn PDF document text
    • http://kakaxazirobolob.iblogger.org/changing_my_name_after_marriage_checklist.pdfIn PDF document text
    • http://joxoganatiwo.iblogger.org/82706205720.pdfIn PDF document text
    • http://copyright-services-us.com/37867794698peobv.pdfIn PDF document text
    • http://urologo.store/ap_chemistry_textbook_onlinetyny6.pdfIn PDF document text
    • http://xxlmature.site/coreldraw_x7_64_bit_full_versionb4upv.pdfIn PDF document text
    • http://petrol-v-pol-price.site/enthalpy_of_ch4nmfa7.pdfIn PDF document text
    • http://confirmationhelpcenter.com/xuxuxuzolujigebupunu91b8s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevewodex.epizy.com/mitsumi_cd_rom_driver_free.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_7c3509aa445c482faee84576e329d036.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/escape_room_game_answer_level_70.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_cb4bc81224ff442b8859811374cd8971.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_f8d4fc994e8b40b6b7788de5cc560f38.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_aee789f03bc64cea8566366dc7532f80.pdf?index=trueIn PDF document text
    • http://nakepusigazu.epizy.com/31720379774.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/azure_information_protection_share_with_external_user.pdfIn PDF document text
    • http://butadiviwev.rf.gd/sasitavabofu.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/zumugupudakigidaruve.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/the_all_american_slurp_read_aloud.pdfIn PDF document text
    • http://xekubot.epizy.com/oracle_aconex_user_guide.pdfIn PDF document text
    • http://fikovik.epizy.com/37707266610.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/tidepo.pdfIn PDF document text
    • http://belajuba.epizy.com/types_of_business_intelligence_tools.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_off0001ae83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE83 5112 bytes
SHA-256: 93593fb3361918b16dac0b8578fe68db702aefc07bae8369434643c29eef02a9
font_01_sfnt_off0001bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFF5 15064 bytes
SHA-256: c50e2d3df14eed648614b068cf544f07a2b60a0b5c7ef9dd47ee3a3994b9bbd7

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