Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad259e435aec21bb…

MALICIOUS

PDF

90.4 KB Created: 2021-03-19 03:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1299ada16efcb8aa0f3c19ff08a70d94 SHA-1: 2fb4593cd5b6a2ba59ba6add1cf255dcaeaae7ae SHA-256: ad259e435aec21bbb320b676e770d13dd41b59a2add0209734c572df66d8419c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL, https://xezojetit.ru/award?keyword=physical+science+textbook+grade+10+platinum+pdf, is likely the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://xezojetit.ru/award?keyword=physical+science+textbook+grade+10+platinum+pdf PDF link annotation
    • http://kemedejovon.getenjoyment.net/75979482511.pdfIn PDF document text
    • http://topcreditcheck.info/what_is_information_technology_business_informaticsq9one.pdfIn PDF document text
    • http://nebo-baikala.ru/lipamunikumed3unq.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/2835355.pdfIn PDF document text
    • http://funseeds.site/rokufolijerofipiwaj15dwj.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/9697568.pdfIn PDF document text
    • https://mikexilip.weebly.com/uploads/1/3/4/8/134868220/zikijonoromep_noruvoxibe_murigigenowu_novugidora.pdfIn PDF document text
    • http://bestunew.xyz/structures_or_why_things_dont_fall_down_wiki7cyd2.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/cuisinart_dlc-7_super_pro_recall.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/d50c9290-397d-4eae-b5a8-9f071a5e7752/770_sat_math_2_percentile.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_af8887ccc05d420f939d402b3a774ec0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/310cc54b-5a67-4f19-bab6-6f7e5cf25c91/25718663789.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_471bbc5537554e128f274cce8afbbc28.pdf?index=trueIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_9114c0f12dea497eae75f8692aff4987.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_9c7396f41a5c401fa7334b9608ea63bf.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_331ecd585fb7413091e1ea43c19e014b.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_b8e10257c94c49c9a043161aa08eb3db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9274ed68-b5d5-449f-bce1-2e918d0bd4e0/scag_ztr_mowers_sale.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_8d3efb70ddb24cb79630f1d294a3ad37.pdf?index=trueIn 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 1584 bytes
SHA-256: 7959cae4d958acb6bff4aec7522263cf1d4b9c57a1f5a271beed1441f8222e7b
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 3728 bytes
SHA-256: b3678927341c36ee37d1e591cb3ae7602bcad3269fd97f5da953f17a940a0069
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 6136 bytes
SHA-256: 5b3a5bd0b9193c3ad39602a1c605dd281bdb0ab8a90f253e95d786d13f4a1955
font_03_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 15032 bytes
SHA-256: 8f99d15ca09dcabfb76ff48481bb7f2564c00c715cb7799e861fab713ccfdd5b
font_04_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 16516 bytes
SHA-256: cb89c281e5f04ecc10d8d30674c65d07bc92d9121f66d3d78d23dd84f1dc2b77

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