Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670bd46357f6610…

MALICIOUS

PDF

85.5 KB Created: 2021-03-24 06:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7725a5f79fad51cae64fd5c5303cd663 SHA-1: d5f8e6f6bd62bf15947ba027b1be0a60a17e7305 SHA-256: 6670bd46357f6610353d58ffbdb77da06474da8404f37024aa1d62ecc5a63121
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that mimics a search result for a popular book, likely intended to trick users into downloading a malicious file. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/award?keyword=netter+anatomy+coloring+book+pdf+download
    • http://vawurabel.mygamesonline.org/what_countries_have_alpine_biomes.pdf
    • http://lazategomid.scienceontheweb.net/how_to_rewire_a_sprinkler_system.pdf
    • https://cdn.sqhk.co/gabisolovima/W9ewigJ/wusibipedivikip.pdf
    • http://visetazide.medianewsonline.com/neurological_examination_template.pdf
    • https://cdn.sqhk.co/molewekane/5jejhbH/bases_de_datos_nosql.pdf
    • https://cdn.sqhk.co/xolovagi/jIhige3/linkedin_sales_navigator_cost.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://merapenerabari.myartsonline.com/pals_virginia_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/68ec7501-67a1-406a-95da-d7643f351f62/3305961694.pdf
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_e6380e15be2c4699a442835fc6a9ee29.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_b960b46398ff454d800b225e39642bd8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6bd7b6f0-9e4f-463a-9c3f-5b61367575a8/bigger_leaner_stronger_nutrition.pdf
    • http://piwakitidi.onlinewebshop.net/gajaf.pdf
    • http://muxoridevifi.epizy.com/wotonijiwaxosadoxeliwi.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_e7128161d4c3476ca4129a8897e12fd7.pdf?index=true
    • http://pavoserelolaw.epizy.com/sample_excel_sheet_for_inventory.pdf
    • https://uploads.strikinglycdn.com/files/a3b64fb9-b6e1-4230-a01d-8e9b2cdcba48/namiwoxovuwademiguparu.pdf
    • http://lazakozezaxu.rf.gd/92098826459.pdf
    • https://s3.amazonaws.com/xajowu/71944640728.pdf
    • https://uploads.strikinglycdn.com/files/ac50adb7-93f0-407c-bd36-bae45b360620/84175182664.pdf
    • https://uploads.strikinglycdn.com/files/e69bd89e-9fae-4b34-bae0-30e6e2725209/united_colors_of_benetton_womens_quilted_jacket.pdf
    • https://s3.amazonaws.com/pusori/advanced_english_test.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_cdae9aa3fa014b8eabda894fce0a0a54.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3e.bin
f3df27e5d77593fdc0c33c231faef4d73076732a6263e7f9fbae917be5d0bcc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 5452 bytes
font_01_sfnt_off000111d1.bin
c263831805bded95c1675001e063f7b1734b7ef2fdbf5938416bcdbf3b20b014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 11456 bytes
font_02_sfnt_off000138da.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 4324 bytes

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