Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68573025f7da3a1…

MALICIOUS

PDF

110.3 KB Created: 2021-03-22 00:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e8417f45ef8d975153cd9c1e803f8716 SHA-1: 9d0462165fbd0053ebda20183da06184d73ab6c7 SHA-256: a68573025f7da3a1f14a0dbe9a0428938c34197efe6eb092c49f049843761abd
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'resalured.ru', which is suspicious. The document body, though heavily obfuscated, suggests a lure related to 'antifungicos pdf', likely to trick users into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the nature of the PDF heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=mecanismo+de+accion+de+antifungicos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5fdee878a1eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_600eaa9d94a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5ff3b667d3b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_60488b9f57b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_603d4b7cebd96.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/how_to_breed_moina.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/public_speaking_merit_badge_pamphlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_603845f82490b.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/petikamov/kozesi.pdfIn PDF document text
    • http://pejemevogoge.myartsonline.com/archeological_anthropology.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/58965285353.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/iomega_home_media_network_hard_drive_software_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/can_you_still_buy_a_flip_phone_from_verizon.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/gebuvotimi.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/dukenaxu.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/lebinagafijajupimut.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/tisatopuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dab4b35-851b-4c8f-920e-c436e421a6c7/capital_markets_elite_group_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/hollywood_animated_cartoon_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ae6ad6-55d3-483d-83c3-03757b8d1a39/citizen_eco_drive_watch_gn-4-s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6c85bf-8430-44b1-b2a8-ebadf476e353/is_real_gdp_the_same_as_national_income.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_off00016f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F32 5352 bytes
SHA-256: f81968d2dd6e7780801aa8e874db44f94f0583c799917eea911aa38e99428e1c
font_01_sfnt_off0001816c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816C 12520 bytes
SHA-256: bbbfd115facb67409b0aff38b21305d52fcbf5c30157b4957fd42d33d47d2227

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