Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6685a1d6fba535c…

MALICIOUS

PDF

81.9 KB Created: 2021-03-27 18:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 86ae389ddb0b733552ace039d66418d1 SHA-1: e61b8d35d56c5c5dceb9f9c2cac441f9f589be60 SHA-256: a6685a1d6fba535ca3ab004cc263edb4d9750933b23b6f15bdba58d838105a03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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=el+banquete+o+del+amor+platon+pdf PDF link annotation
    • http://pimazisiperej.iblogger.org/candide_ou_l_optimisme_rsum_chapitre_par_chapitre_en_arabe.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/american_gods_season_1_parents_guide.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/dakezawegoxapuwofoze.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/lujunanujokojitumuzofoga.pdfIn PDF document text
    • http://zegevuk.22web.org/excel_inventory_template_with_images.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/academic_writing_format.pdfIn PDF document text
    • http://febisulel.22web.org/situational_judgment_test_sample_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_8f72e39ab19c48048a992182722753f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/14134338454.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/resident_evil_biohazard_xbox_one_digital.pdfIn PDF document text
    • http://lijazujarakowom.epizy.com/carmen_sandiego_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/30944596388.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/jaxaferezose.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/cambridge_english_empower_c1.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_1996c5cfe3e14fb3be2e0159c82c21f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/dragon_quest_builders_prima_guide.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_8a5ffe29dfb9443c91d5aa6617c6f328.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_d42de40d633a492b8cbe7baffe11c5b7.pdf?index=trueIn PDF document text
    • http://rovafitazilom.epizy.com/vuwibupapugabi.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_ea07c7d60aa5481e829f444c5cef4e92.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_1bd2acee6558495b868f0a2758f56230.pdf?index=trueIn PDF document text
    • http://lipileg.rf.gd/annealing_adalah.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_f37ae91fa7884e69bd762a12e410555c.pdf?index=trueIn 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_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 5232 bytes
SHA-256: 14ca6cf8911cf581fac6183f45e29a2ea09daf60c48a65955f722fa27e9f4927
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10964 bytes
SHA-256: 885c2ddeb4b1c5e62a795d672f9c097530afc0021d25305bac3c40e5d8d95226

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