Malicious PDF — malware analysis report

Static analysis result for SHA-256 256b1773771b5b54…

MALICIOUS

PDF

74.9 KB Created: 2020-12-27 08:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9509f827e7965731c3da12a8bbba0550 SHA-1: c3061539c0eb0ef4a4c8cb8718d163d575b15a33 SHA-256: 256b1773771b5b54c599bbd6ba801f8be3e30ccfaf7f9b152d00597e3ee3aac5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL likely leads to the download of a second-stage payload, disguised as a software installer. No scripts were extracted from this sample, but the PDF structure and embedded URI are sufficient indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=appserv+windows+7+64+bits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f924fa6958d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5fb4905c56342.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/bTfjh92/zombie_wallpaper_engine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5f9f415c5cc6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5fce7a9114aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fd8155664396.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/s6xhcTq/furia_de_titas_2_download_utorrent.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/sjaQBib/h_band_2._0_manual_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fa889ee0b485.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hegdkia/reposteria_mexicana_pastel.pdfIn PDF document text
    • https://cdn.sqhk.co/tadawatimi/atWijhh/15255832176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fbdd25ad3554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fa635d3a9e35.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/Llhegf2/cafe_racer_bike_price_in_sri_lanka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fe7dad071fc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/82eea736-8dd8-4155-8641-23578e8e4f7b/forge_of_empires_cheats_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaa398b-4640-42da-9d96-9c03e3e16f0d/20325943036.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 5104 bytes
SHA-256: 694d74cdf1950d712476a5beed2cd1c784af5b5c5f67c979d191ef5b7bff7bd5
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10908 bytes
SHA-256: ba4c533547cb3c4aa9d81ab7ec675379b798dab87d7baa6fce605a407dc24da6
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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