Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef1589c889377b0…

MALICIOUS

PDF

84.0 KB Created: 2021-02-23 02:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9360273b58d0733f3f93166d15fc2af SHA-1: 50bd853677166373adb8b56c271213841f6d17c1 SHA-256: 7ef1589c889377b069df63e636a7861c58325ae54dc83a64a19ff7bb225930b9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing lures. The document body, though heavily obfuscated, suggests a context related to 'Medicare claims processing manual', aligning with the 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://maypoin.ru/123?utm_term=medicare+claims+processing+manual+chapter+12+section+190 PDF link annotation
    • http://love-cosmetics.shop/misitirusofoxor151vv.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/pNAjahl/what_are_some_interesting_facts_about_mexico_city.pdfIn PDF document text
    • http://handler-autoscout24.com/zozisofetolufazalosapabodkuj6r.pdfIn PDF document text
    • http://afracheat7.xyz/966106955370mv1e.pdfIn PDF document text
    • http://wordsidepost.top/bibiwatjuj8.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/6Djhjea/90508618549.pdfIn PDF document text
    • http://2022god.com/24190009257441ka.pdfIn PDF document text
    • http://mini-cam-v2.club/bounce_ball_game_download_in_phonekyt3g3r.pdfIn PDF document text
    • http://brosbass.com/halimbawa_ng_travel_brochure_tagalogz2bla.pdfIn PDF document text
    • http://dnepr24.info/how_to_type_alpha_character_on_keyboardfe5bg.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/vufupu/jidegava.pdfIn PDF document text
    • http://moliwofasekimu.epizy.com/lake_superior_guided_fishing_trips.pdfIn PDF document text
    • http://maweriza.epizy.com/thailand_visa_on_arrival_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/61392868995.pdfIn PDF document text
    • http://bidemuv.rf.gd/mojutonovonugizem.pdfIn PDF document text
    • http://rujavesejijoram.epizy.com/lawn_boy_320e_snowblower_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/adobe_photoshop_camera_raw_free.pdfIn PDF document text
    • http://tifiponarem.rf.gd/total_quality_management_focuses_on_the_satisfaction_of.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_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 5976 bytes
SHA-256: d49c458070099180476c812a4dc654c83b6ed7a2edf5b9bf9dd810d557cbf0e4
font_01_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 12016 bytes
SHA-256: dbef114dd61f4f71ff9ae9959603f04e1801347fe50ba99b3f582e61cdd3e947

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