Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2a6e3f4b4329f4…

MALICIOUS

PDF

103.0 KB Created: 2021-04-07 21:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01db802253f8313f9d906867c9634ece SHA-1: ed9b01862476fdd88840d72f5c1e37928924f3f3 SHA-256: 5c2a6e3f4b4329f4df9aeefd95a07a28d177eea1e8e0aa6b8dcc64983ca4491b
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'rehab a shoulder labral tear' and application form titles, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/aws?utm_term=how+to+rehab+a+shoulder+labral+tear PDF link annotation
    • http://help-lnstagram-verifycopyrgiht.com/la_biblia_hablada_romanos_169goqo.pdfIn PDF document text
    • http://andyhong.blog/lebara_ksa_head_officea4h0k.pdfIn PDF document text
    • http://usmileofficial.site/wukilorajevojtgx1y.pdfIn PDF document text
    • http://sis-paypal.com/tuxoraxusivofurid1u8l.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/ignou_b._ed_application_form_2020.pdfIn PDF document text
    • http://eslife.pro/72686206741dxzql.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/91084631445.pdfIn PDF document text
    • http://peuer.xyz/962400241719nsfv.pdfIn PDF document text
    • http://myimperfectmomlife.com/why_is_my_thermostat_not_turning_my_furnace_on3zt79.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/18691530357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ba5cc6-76e5-4ff4-a228-b5e9275d9326/proform_415_crosswalk_treadmill_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277e4a1b-73d6-4d79-9f1e-6c329613e6f6/wuwozurojoferafevoman.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/ezekiel_saw_the_wheel_way_in_the_middle_of_the_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640aa711-09f8-4437-9ac9-5c2cce608521/sig_sauer_p229_40_cal_extended_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/98569998900.pdfIn PDF document text
    • http://rawegutidum.onlinewebshop.net/arthur_kingsley_porter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034d28a4-9f6d-4c49-a2ae-a2e1ca6fcbf1/6650332340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d15a067-4cbe-4c40-ab36-300a1e3ccf39/hitachi_framing_nailer_nr90aes1_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6889254f-90e6-46c9-83e9-b9cb61f5de7c/why_is_my_hp_envy_5052_printing_blank_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/pathfinder_cleric_healer_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3404ad5-0313-4fdc-abb6-a3d4bdddb549/star_citizen_ships_to_buy_in_game.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_off000155a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A0 5108 bytes
SHA-256: 7f91e5203e76636256271ab48fc97205e85c3098e9a5d68367896cd8367c110f
font_01_sfnt_off000166fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FD 11764 bytes
SHA-256: f61c977a769215c6483f635c9c56b8b97fd156d718631aa825bc27b01d08f103

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