Malicious PDF — malware analysis report

Static analysis result for SHA-256 959e2af30d63604a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 10:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 50c1e6843134c482b62fc1e75282c06b SHA-1: 2fae62a864341e08515aef40f401d9fc0f9e6e5e SHA-256: 959e2af30d63604adf11a8574859ab03b3aa829943d3d45375f010700e56410e
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URLs designed to redirect users. Several heuristics indicate a malicious intent, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, suggesting the document is part of a scheme to generate traffic or distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://resalured.ru/123?utm_term=game+agar.+io+android PDF link annotation
    • http://modernstyle.pro/chromatic_harmonica_instruction_booksbv7h9.pdfIn PDF document text
    • http://film123watch.com/is_no_game_no_life_good_reddit9gy5k.pdfIn PDF document text
    • http://topcreditmonitoring.info/role_of_committee_chairperson5muoo.pdfIn PDF document text
    • http://uspeh.icu/42740099722n2ox8.pdfIn PDF document text
    • http://gdztut.com/sopa_de_letras_computaciond62tw.pdfIn PDF document text
    • http://b2b-servis.ru/ratio_worksheets_7th_gradet24eg.pdfIn PDF document text
    • http://neojust.ru/17414248721ghrua.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/23a40d70-a94c-4c17-b77b-5267ea1d1fd8/cual_es_el_campo_de_accion_de_la_psicologia_clinica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7af9060-654e-4eaf-a8de-cf402dd2d0a7/what_does_lusus_naturae_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd79858-aec2-442f-b3bf-dce95f9fc4ad/viditit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe50547-f03e-48a7-aa21-915358103149/99806196076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3df8c68-c8cb-48c2-b73a-c58078cf6e7d/what_is_ho_scale_in_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c080ae8-e1d5-4957-84e2-5c3d2f72724a/75687170087.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_0cfdedb7d57945afb279471f9ec6683e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61ea083-b004-4116-8e4e-97f9ab1866df/74656083259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d06839-d14d-4053-b093-919736745591/52965991261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e18848-44ed-4154-b769-9a8912bca694/vorixuzaxewip.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/prueba_de_comprension_y_analisis_la_vida_de_lazarillo_de_tormes_tratado_3.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_5c51e91a0371485f9af39ed77d9c86e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/how_to_adjust_pilot_light_on_gas_fireplace.pdfIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_77208d157af14cf599c4b0b00991d335.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/42259540543.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_6a290e93a2f64bbfb39ab34c5f1b362a.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_8ebd1f740efa49a48072bc441ca80107.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/report_card_comments_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/zaluzovutofusa.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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 5000 bytes
SHA-256: 3075e321247fb95020585ca60f2c7e92216c3409bfae96e28f66fb1d1cedf72b
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 11816 bytes
SHA-256: a04a3d4b4a7f594693c1869210b1ba7a74cc364213d35dad21cb21da9e097027

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