Malicious PDF — malware analysis report

Static analysis result for SHA-256 283cb40bf68fbf25…

MALICIOUS

PDF

117.7 KB Created: 2021-03-09 07:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1420dddcb1b21ec63aebb7d68a01017f SHA-1: a7eaf0c7e3563378a1d914b33d7e3f0270f89583 SHA-256: 283cb40bf68fbf250f592c776509968ffab6a6c5875890e585660d370c3ac678
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://mezovuduw.ru/wb?keyword=what%20was%20the%20purpose%20of%20writing%20the%20canterbury%20tales', is presented as a search result, likely to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wb?keyword=what%20was%20the%20purpose%20of%20writing%20the%20canterbury%20tales PDF link annotation
    • http://jipetabonitu.mywebcommunity.org/gotuzeragisisozozigas.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/primetime_adventures_3rd_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fdd6b04bcd94.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/jfAm2vj/porelumame.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/bowflex_pr1000_home_gym_accessories.pdfIn PDF document text
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/4301067.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/29387733365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_602fb4ae7c738.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/kawugogiletowola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd9915d8dca1.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/1309102.pdfIn PDF document text
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/gaxumofi.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jgeNcaD/create_a_meme_list.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/26cac8cd9e.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/angle_bisectors_of_a_triangle.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/wNjeieW/guide_succes_human_fall_flat_workshop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/60865442194.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/the_kid_who_ran_for_president_read_aloud.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_7b0c9e8d888a425995fe5717d694edd1.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_862e48f41ecb431884df84546f0cd1bf.pdf?index=trueIn PDF document text
    • http://gajamozaxekega.atwebpages.com/assemblage_bois_menuiserie.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_fdc5eceda68b471bbf3c944be6e24fe4.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_1d77aec99b6c419d808ab5f116f1e212.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_53de77826c1749afb1daa91646eba46b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17825 5624 bytes
SHA-256: 082dd32f87b56c7f8eb8323786581843ce046b5ac06073587c748e6eb8bce5d5
font_01_sfnt_off00018b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B69 12144 bytes
SHA-256: 87f1084f4fe5397d2663f4aeb7a33c9aaf6c0d1376ebdad4844890652ee7877c
font_02_sfnt_off0001b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B357 16100 bytes
SHA-256: 26b31ba2131ae2f7da025a7fda5e9dcfe79fc1d25f6641dd8c13613e564b4b69

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