Malicious PDF — malware analysis report

Static analysis result for SHA-256 816c72b2a888a502…

MALICIOUS

PDF

85.1 KB Created: 2021-04-27 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e8c7aa362f429448bce32518d80c3826 SHA-1: 286f370ddf516e300c8f3731110ddad96b7cd7bb SHA-256: 816c72b2a888a502de00c4b42b509158211d11c0aeb2c454c1feca3e4d7d7658
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, indicating it functions as a link farm. The primary malicious activity appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=percy+jackson+and+the+olympians+christian+review PDF link annotation
    • https://cdn.sqhk.co/morureju/Hjajige/21794359692.pdfIn PDF document text
    • http://ropufowi.iblogger.org/81111933686.pdfIn PDF document text
    • https://cdn.sqhk.co/kugeturo/cieKhdK/download_train_track_pictures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c96d9893-2c3d-499f-b045-1fe93d5196fe/11636823540.pdfIn PDF document text
    • http://nafipeni.epizy.com/coleman_dual_fuel_lantern_globe.pdfIn PDF document text
    • http://bedanodog.rf.gd/international_business_bachelor_degree_salary.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_cc12c686e4a846e3854e3d653a32bffe.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_88a16defbd4d46b8948e6f802546e3eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/26225526953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53980ce4-9a75-4dc6-9dd0-879709d71efc/digad.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/21465098733.pdfIn PDF document text
    • http://rutukoka.epizy.com/concepto_de_matriz_foda.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_59c5cb30d41f4c74aa37cadab95f81ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/yard_machines_snowblower_carburetor_cleaning.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_debc209daaa14a43801880d5223cc09c.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_5800aa3d191e4254b1b1c105ce55da4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a897fc-574b-4786-a082-35076935a887/rurulane.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_35a571ff527541e88d4f3bf58903443f.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_5cb64dd0dab148d38c9d5ac0691af189.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_f0e0179ee5e2450b88316d6a77dfb229.pdf?index=trueIn PDF document text
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_37f05b219b714c4db749bd06af24da85.pdf?index=trueIn PDF document text
    • http://vumajinopaxefu.rf.gd/alex_rider_stormbreaker_book_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/british_tv_channel_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 5496 bytes
SHA-256: 24e3ac43ffde074f13623eb61bb9c7439f9cdd3956e71b1c953cf7619d403ce6
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 11156 bytes
SHA-256: 609b7592ca1b6a63f0e231bba8139aee906ec6ba7b8c870c227712543e3e429c
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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