Malicious PDF — malware analysis report

Static analysis result for SHA-256 432dc8aaa141a6ea…

MALICIOUS

PDF

96.5 KB Created: 2020-11-16 20:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 24c44531b0daef8a929805e94187ce81 SHA-1: d72cb0d31169cdf0de1665fd8f4287c71f91f117 SHA-256: 432dc8aaa141a6ea3d2820b65ce97dbd198e8df75e7c4f4b57ec48d0936cc69f
156 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 0.9987

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://trafffi.ru/123?utm_term=what+is+my+dad%2527s+first+cousin+to+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f9124837c5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f9dba069dd49.pdfIn PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/71d8e5.pdfIn PDF document text
    • https://://s.yimg.com/os/creatr-���������������-������������������/2020-In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/2157c56e-f86f-469c-aa3c-3a095420025d/bigelogufovop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4359d1f7-e756-48f0-8579-79ee22ff4fd3/nabojatodavidamojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dadd5b-5971-4897-8bb4-1da837e38f7b/47729741493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7519e82-b76c-4fdb-bbad-a2dc91b54c42/gen_4_pokemon_games_release.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04ae71b-fc90-4cb1-96d1-a7f13ff87e7a/francis_scott_key_middle_school_fairfax_va.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/61556979983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90eaba9c-51ad-41fd-a726-03952fefc289/ultimate_kauai_guidebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860fb25d-2f3c-4517-b963-597d7f28b695/mazda_cx_5_repair_manual.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 5380 bytes
SHA-256: 33b0b60c93838ee5697eb553676870428d7aeb1022f05ab2fde311d44794507c
font_02_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_03_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 11620 bytes
SHA-256: eab99a324db074b0b1bc4b4d3a4b277c7374a4e0e8b5a8d22d303c495c4f6516
font_04_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_05_sfnt_off000148f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F6 14668 bytes
SHA-256: 2708c053b9bae6f09d4d14abb4d4bbc560e80fa6366c5e5f192ecad07b1e04bc

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