Malicious PDF — malware analysis report

Static analysis result for SHA-256 2460d8577db89318…

MALICIOUS

PDF

77.4 KB Created: 2021-01-25 08:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37e8fb8cb70175010df2cc2521bfa33d SHA-1: 7f19a813e524f3efbc359f3b0d73429fa76afe40 SHA-256: 2460d8577db893186270c6be303a396793e5044b62249ff1f25d061380a2e7fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful sites like 'seumenha.ru' or 'musc-media.xyz'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=small+group+covenant+agreement PDF link annotation
    • http://musc-media.xyz/ramipafifasugimck1ha.pdfIn PDF document text
    • https://mapatujil.weebly.com/uploads/1/3/1/4/131454051/vubofirawu.pdfIn PDF document text
    • http://kukushka.space/machine_rear_delts_reverse_pec_deckpjcrl.pdfIn PDF document text
    • http://pusuwanoxanopo.22web.org/c_o_p_r_a_full_form.pdfIn PDF document text
    • http://logvoz.ru/12115831402fpw1y.pdfIn PDF document text
    • http://kpupnov.pro/joganop2tco.pdfIn PDF document text
    • https://wuvenenuw.weebly.com/uploads/1/3/1/3/131383928/389720.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/c959c23f0e6d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/bubble_sort_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/adblock_plus_browser_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/attestation_formation_exemple.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/laromisuvitowanimosasu.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/escape_room_answers_level_149.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/17229833817.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/fokawasobetusaku.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/minecraft_pc_full_version_windows_10.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/maxevurudazupejinadetito.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
    • 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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 5240 bytes
SHA-256: c5f3576c1483681f38c311bf41fa33043feb467ef3a9eb5d6f34252def226637
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10536 bytes
SHA-256: 629b452fc46d81cc704af5b9f566e9dfc1f83293dd188e214c43ca24bec27380
font_02_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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