Malicious PDF — malware analysis report

Static analysis result for SHA-256 f304247956e192d6…

MALICIOUS

PDF

75.4 KB Created: 2021-03-21 06:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: acfbeabfb16ced3298d4534fcf556c5b SHA-1: d046bbfda721539b13ad355fa8e178c851a27bf3 SHA-256: f304247956e192d6f3465c4f0666b8bb614ff5a898a269b0084efcda9e1027b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jacksth.ru/wix?keyword=sabias+que+curiosidades', is directly associated with the malicious activity. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=sabias+que+curiosidades PDF link annotation
    • 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/39bd0f44-e9d0-4755-8ab5-07258310c38d/nibefukofulobuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fbd781-03b5-4f66-a697-4ac5648f004c/what_is_a_parallel_structure_in_writing.pdfIn PDF document text
    • http://penobasewid.rf.gd/13176201126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ec3ffc-12ee-4d5e-a07c-b7ca5d8607d7/what_is_curriculum_in_simple_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38276f5a-3dcb-4121-a0be-e1c29fb2aefe/sex_on_the_beach_recipe_with_chambord.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_acd6d6691ba4430495fc2707b92d2209.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3e9dae-7168-4020-b74f-2b448eec830e/quadratic_functions_unit_test_answers.pdfIn PDF document text
    • http://mibavipef.epizy.com/vemafujidasorefig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc74ab1-2598-4e35-b501-9391f4879b7e/39018295191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e159fb7-adee-4fa8-b1e1-722c3418be4c/navokexuledumulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b410d275-f89e-4c67-a218-92febd571c8e/42444871307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de825b03-9e97-476e-a875-eef4e8aff3c5/penny_stocks_to_watch_asx.pdfIn PDF document text
    • http://rofijukerogozo.rf.gd/pulse_secure_appliance_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae000cf-e5ab-4f53-9b8a-7a6b83bac7a0/cisco_e2500_bridge_mode_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d89afa-bd3e-45e3-82e1-7335622098b8/bozujozowezekigokapekep.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_e97dbf1cddac4ad4863fa20576a2fedc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6818ce62-c4ea-407b-8a03-f8cc4ef52343/dipisarepakelakewenok.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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 4968 bytes
SHA-256: 4363704ae0a54f6e4bea2dd757def348b1be6aae770fd6eee31e6f8012c4abe3
font_01_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 12100 bytes
SHA-256: a5cd68af0306796d127ca4d356916c7597959589715d466d0ebf261d71643737
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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