Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd86b9834f500e7a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 00:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28bb8a466ec57bb19cd3ec120fb43ef6 SHA-1: 9006654897ba4f8367cb2e0fea496b6d29ad51e2 SHA-256: dd86b9834f500e7ad9875da1dbeed847516ba2b9d52272e6adf15562ce43f763
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://seumenha.ru/123?utm_term=bully+anniversary+edition+math+class+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff68cb9171fb.pdfIn PDF document text
    • http://smartline58.ru/how_to_clean_mitsubishi_heavy_industries_air_conditionersgcfb.pdfIn PDF document text
    • http://toportt.online/app_china_apk_2018mo1jh.pdfIn PDF document text
    • http://like-store.site/25592772956o4x1t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_5fcca7c5010c4.pdfIn PDF document text
    • http://eeeeeyyy.space/257990374125pc5e.pdfIn PDF document text
    • http://forkidsshop.online/mindtap_cengage_answers_microeconomics_chapter_145fugn.pdfIn PDF document text
    • http://helpcreditscore.info/address_block_format_letterqdsh8.pdfIn PDF document text
    • http://dostafood.xyz/14309356546y2pow.pdfIn PDF document text
    • http://legiontry.online/85370902916xl02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_3b48126d9c8a4055a7772982c4b7ca6d.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_5473ac21a5db4b129ac7813c82eeb85a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c564fb9-811e-4fed-bf31-6a711e27d980/el_dador_de_recuerdos_completa_en_espaol.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_909f5c7cfb294b17975ad26fcd3b5c8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f4f345-164d-4625-a94d-fd5444eb9c44/nopakudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a1919b-db2a-4ae4-9748-2b228be22a88/xojidebatevufupavamofoxu.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_51097602a1bb4da98a1e60f5019810eb.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_45b1ab2e27fd4b60b2ceacbf58f24a57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4128cf-b203-4b47-b6c8-ae9d9d55961c/23060486325.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_adb0fa3504784abcac5329e7337a01f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/172c4257-a9cf-4791-8f59-f7b4d187f247/lodobofigedekuvativuva.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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 5480 bytes
SHA-256: f8bfa41c1edd90d2528cf8ad339ecb6f57c5594b48f93db376ff689db04bd8f4
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 12468 bytes
SHA-256: 02f979a88326b5451f2c15c266e2c0a0a8305c48d1e8f20d22d2e6425223e9cf

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