Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f3f84a9eafaf53…

MALICIOUS

PDF

92.3 KB Created: 2021-03-25 17:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a30fad5a6337e75e23b9e466b00cf0cc SHA-1: bfe857f4c5fe1ce926af1cf62fa237db31b6a134 SHA-256: 10f3f84a9eafaf53ce0e472f311d93230e6c799dc53d1fb28e38c763ed46fd4b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, with the primary one being 'https://mezovuduw.ru/award?keyword=future+trends+in+airline+industry+pdf', suggesting a phishing or scam attempt. The PDF's structure and content indicate it's designed to appear as a legitimate document to trick users into visiting the malicious link.

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://mezovuduw.ru/award?keyword=future+trends+in+airline+industry+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456712/normal_6053cba3c5a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff8ab365f58c.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/emhdSjg/18895954147.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/idjiDgj/jezovukafo.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/que_es_la_acidosis_respiratoria.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/agnus_dei_piano_sheet_music.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/easiest_way_to_learn_autocad_electrical.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/9c6d526b-5807-49d5-847b-f064b99c9939/sumilifaw.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/pelifoveki.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/badlion_client_1._7._10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d2ccd4-a529-43be-a9a1-56336e0c7fd7/what_order_does_the_mysterious_benedict_society_go_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a81c20-c98e-4319-bcae-76db1d46c65f/62629465015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c4a6df-bc69-46c3-9c8d-874b1a16df2c/82714520837.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_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 5092 bytes
SHA-256: bfd0dc6602122fafc7bf3c59be52230621017fc0b44a062183a612eac9cb5995
font_01_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 11580 bytes
SHA-256: 299055d07b135036640af44a84b12c3bae57e81c0002d071c6b1b050e1aeb76c

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