Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f2e21d24665a1d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 22:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28e961f27a489bc371d7fd7e5118e74 SHA-1: 9005794256bb0014bfb784822bf7f98a638c0e4a SHA-256: c3f2e21d24665a1d393c5d1f1528b897f604916ff10afc82ca10d173b81a6e9d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result for a specific manual, likely to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=barnett+archery+vortex+manual
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5fcc4d6b43920.pdf
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026b31b9fb80.pdf
    • https://cdn-cms.f-static.net/uploads/4369760/normal_6021acf1e24b1.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60224f8eb79b8.pdf
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5fe06fb8403c3.pdf
    • https://cdn.sqhk.co/jiluputumusi/4iajhih/89779325198.pdf
    • https://cdn.sqhk.co/fexejikexew/ieAz7LX/disc_brick_high_score.pdf
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601f9fbd8d3bd.pdf
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fd71b54d5546.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_5fe7828b79926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/983416bd-ef25-4232-b9a0-33bd5245a089/titan_440_i_packing_kit.pdf
    • https://uploads.strikinglycdn.com/files/1bef58fa-8b2d-47e0-8606-a2fc3025656b/ravararuzenugidumafivu.pdf
    • https://s3.amazonaws.com/marimejerebo/59566676927.pdf
    • https://s3.amazonaws.com/saziwijaxodav/before_written_language_how_was_information_passed.pdf
    • http://kozogasivufi.myartsonline.com/what_jobs_can_i_get_with_a_degree_in_information_technology.pdf
    • https://s3.amazonaws.com/petikamov/67185679280.pdf
    • https://s3.amazonaws.com/supefujoxopubu/pretty_little_liars_season_3_episode_24_spencer_and_toby.pdf
    • https://uploads.strikinglycdn.com/files/c4367719-6009-47c3-b2a6-8be76ad2df75/what_type_of_lawyer_gets_paid_the_most_in_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/315d8bea-0857-43e0-8c4d-bed7c211c233/28478038327.pdf
    • https://s3.amazonaws.com/nezanurugega/epp_foam_sheet_for_sale_philippines.pdf
    • https://uploads.strikinglycdn.com/files/6c166647-3655-47c6-af25-f00479728a87/57807000490.pdf
    • http://vujapoguxesak.myartsonline.com/how_to_make_a_crown_royal_chair.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e674.bin
c7c0edcb8a2c24c43a274080961bef8da2e9862e03829970f8c8ddcc6bc4f0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5140 bytes
font_01_sfnt_off0000f7d2.bin
cb334acb0ac12a912be71fdd1cf70cfc6f436e7398a31fe8798c075cef34f783		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10640 bytes

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