Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cbec189257bdeb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 01:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4fd8630c56f076d00fc29a3d9e4b9790 SHA-1: 1874c7a708c4654f7b77aa3ffa5f20a6fe95928c SHA-256: a6cbec189257bdeb6741ca61bf1a87f69631451b49944d3cc6ab5a72a9e69faa
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing or malware distribution. The PDF's structure and content suggest it's designed to trick users into visiting these external links, potentially leading to credential theft or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=gre+words+with+synonyms+and+antonyms+pdf PDF link annotation
    • http://pupilobasam.iblogger.org/xigozegukiladufi.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/c1jgigt/company_of_heroes_2_wehrmacht_tips.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/63854554674.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/2icAvif/formula_1_2020_pc_key.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/xnjdYXm/97483195967.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/emotions_definition_and_types.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/ajciieW/how_to_slice_iceberg_lettuce.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/hcgikjd/16504401939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuxegu/what_countries_have_50_shades_of_grey_on_netflix.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_e6689c4115184bf7b281cdbd335bd751.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_32173fec4e5d4c38adde4106bcf3db86.pdf?index=trueIn PDF document text
    • http://galexuduxegi.epizy.com/victoria_symptom_validity_test.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_20171f2cb62a4dbd940f8980ef1f760f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/jalukavubogovedasavanuxe.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_909f872f1889453198bf4c20c0860b70.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_166d3d9454aa4c31b6f6b11d0075ccea.pdf?index=trueIn PDF document text
    • http://kuwukazisopof.rf.gd/online_play_games_free_without_ing.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/accessory_organs_of_digestive_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/mole_concept_chemistry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/41652751752.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_962896fd687045568c135b0231c0fbf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/flash_all_purpose_cleaner_safety_data_sheets.pdfIn PDF document text
    • http://kobinegugagikag.epizy.com/congenital_heart_disease_articles.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/first_1000_chinese_characters.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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5476 bytes
SHA-256: ca0d4b6df1e59656a5963667246101ecae12a1384e098866a3eabb4b19edb31e
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 12252 bytes
SHA-256: b5fe1e5eb28ac43beea1493dd3a3769687a0b9753c1cf244078750d9b1d29ad1

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