Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c942f4851ac849d…

MALICIOUS

PDF

74.0 KB Created: 2021-02-17 21:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62b1ad8a9420ccd6837d22ea6f83ec9a SHA-1: 47f9d5ee1f248bb23ba40fb765f64e60913f67c9 SHA-256: 2c942f4851ac849dcb8460c37842b8a336fab319ac445cf0e65b4150e9267cd2
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a spam or phishing campaign. The document body, though heavily obfuscated, contains text related to book titles, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/strik?utm_term=nora+roberts+books+in+order+2020 PDF link annotation
    • https://cdn.sqhk.co/webuzifinuno/fIqaifr/mario_smash_bros_coloring_pages.pdfIn PDF document text
    • http://imedo.ru/1266392181ab8wb.pdfIn PDF document text
    • http://meblik.su/fortinet_nse4_6._0_study_guide15ru0.pdfIn PDF document text
    • http://ita-fitness.fun/57304427408kfzve.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/cJiboig/railway_app_download_karna.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jhcjeQv/fitazazufoxewizejefigupa.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/IigswyT/oscar_the_grouch_gift_set.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/6heFjgg/kuvafuvuvilufiputukakonag.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/lhg7Jzg/lacrosse_goalie_stick_regulations.pdfIn PDF document text
    • http://igcopyrightclient.com/jazeparosofeliwigojosezsi84.pdfIn PDF document text
    • http://help-nanny.site/94137360386wp1cb.pdfIn PDF document text
    • http://rusherx.studio/gate_2016_answer_key_physicslbcp6.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/ejehdhg/gedetapexetel.pdfIn PDF document text
    • http://jgndegs.info/mutitijenatoxibagigt71q.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/JgdFiaD/6075830666.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/banula/6413874600.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/beat_saber_songs_not_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/facebook_developer_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/calendar_template_2018_malaysia_public_holiday.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 5236 bytes
SHA-256: a08c3ea7997ead20c90cd51d79df9b7e47823a5e6eaead35b0a30cecb15271b4
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10332 bytes
SHA-256: ade1689ac8392d85c24adcb4313905a54a8ba6524de03e615e93126144fc2029

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