Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a1f401384b5628…

MALICIOUS

PDF

72.7 KB Created: 2021-06-11 07:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d54ab39ca20421739503bac71f0e8ef8 SHA-1: 249df4dde4a31dc01de45197077210d43cc50af0 SHA-256: 67a1f401384b562852df758c4fdf6072435761c940b2fdd0e963dcdf0897683f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://allytemp.ru/pbw?utm_term=hungry+shark+unlimited+coins+and+gems+hack PDF link annotation
    • https://wegusolojemirub.weebly.com/uploads/1/3/4/5/134597015/231ad50f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_60c0f781b7978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fc8d25a9a035.pdfIn PDF document text
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/4bf49ab0.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/415e9e17f97d09.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/7864e66b-5946-4b5a-b77f-e003127b3619/nasipizirukixemijifetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91df09ab-206b-4070-8816-938f2b1266ca/ncert_solutions_for_class_9_maths_free_download_in_hindi.pdfIn PDF document text
    • http://labidan.pbworks.com/w/file/fetch/144712074/dexaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc25e35-6a6f-41be-9d92-aadbe7b13434/bezirusunubupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8cec17-a7f2-44c7-8780-5f456a8b2a74/denon_avr-x1000_network_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a72121d-91ee-48d4-b76b-3d534be61e8e/finimisujawo.pdfIn PDF document text
    • http://dukujaxosap.pbworks.com/w/file/fetch/144829638/how_to_calculate_subnet_mask_from_ip_address_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f6994e-12ba-4cb8-a653-4f492617a02e/is_shortwave_radio_still_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aeb9461-c951-4950-a7f3-e585a2f74f85/sufawoxanibemoxorabolabo.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/w/file/fetch/144986664/5013970898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de053a1-4cda-4fa5-a636-bada6b3f0f08/avengers_infinity_war_script_download.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144587850/90705068104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749e1b1f-6650-4712-b9cb-402aac33ebaa/10.3_inscribed_angles_worksheet_answers.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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5480 bytes
SHA-256: 700303267c4d066ef18a798536476b1d46289f87d5657d09a04fe2d3c083ad3b
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 10028 bytes
SHA-256: 9d5736db06fe228d719db21d74e72f5b56061e44c9878e30b078a90781535885

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