Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4526b16ffe8b34…

MALICIOUS

PDF

94.5 KB Created: 2021-03-22 21:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35345ced1fe0a934cc6a4ba023df732c SHA-1: 983622603b7a592121a0b5b02d86179472f24f1a SHA-256: 4e4526b16ffe8b3402928fa1fc62e9352d645dee5b9528f449bd4bd7d0455434
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/123?utm_term=4d+printing+seminar+report+ppt PDF link annotation
    • https://cdn.sqhk.co/remezebona/jcbYiaB/hmrc_self_assessment_payment_dates.pdfIn PDF document text
    • http://vodoroding.info/73221289195epbh5.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/cN3leYq/line_of_defense_tactics_tactical_advantage.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/jaieWwY/roku_settings_screen_size.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/6415120.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/cgehg2o/pepper_iron_man_2.pdfIn PDF document text
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/6844048.pdfIn PDF document text
    • http://ledy66.net/nocardia_brasiliensis_tratamiento6f3fl.pdfIn PDF document text
    • http://creditscorecard.info/3589910228eihv3.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://s3.amazonaws.com/kewakuko/nutase.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/clifford_the_big_red_dog_book_series.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/40374888055.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/free_suggestion_box_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/canzoniere_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/setiso.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/65703694328.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/feguvuba.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/microsoft_excel_2013_tutorial_download.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/starcraft_islander_boats_for_sale_in_michigan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 6312 bytes
SHA-256: a6cd26da773091196e90c9f63981192ba4b20374e89944f4768c3a333c18d09b
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 5028 bytes
SHA-256: 5389dca02f235b8fb6bf557e92b8ce260c01a3c873681d559dff858c257fdfc3
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 12160 bytes
SHA-256: b38f765a033f6b83a3dc6347d507b081a0ef3de503bad99cb9159659c7df0e19
font_03_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 16260 bytes
SHA-256: 1b3a7c1b7bc451495b69e6c2dc925dfa634ebf3cd17a1c22ac82dde46aeedc8f
font_04_sfnt_off00015e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E05 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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