Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a79b3102d2b6c2…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 00:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337bb821be898e4e7e6afffac2fe7a0b SHA-1: d04a0c5b2168c78dff53f892da64aa82da7f7148 SHA-256: 69a79b3102d2b6c28e3a582c76d8084146925e28821fa68a04d3111afc3a3df3
156 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 a machine learning classifier. It contains a large number of external links, indicating a link farm or SEO spamming operation. One critical heuristic specifically flagged it as a 'PDF_SEO_LINK_FARM' with 30 PDF links, suggesting a primary purpose of redirecting users to other malicious or spam content. The presence of external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=abacus+addition+worksheets+pdf
    • https://cdn.sqhk.co/nexetifosam/ieADqjh/lumaletuvipewuletopu.pdf
    • http://specrazreshenie.com/the_norton_anthology_of_english_literature_10th_edition_volume_2_free_downloadofot0.pdf
    • http://jurelireroxux.22web.org/71293533812.pdf
    • http://xibiselid.medianewsonline.com/lajuv.pdf
    • https://cdn.sqhk.co/dakagugi/jh4MoLt/matchington_mansion_hack_ios.pdf
    • https://cdn.sqhk.co/gabisolovima/ibhcgdZ/fifoxofales.pdf
    • http://jobediniberine.scienceontheweb.net/pafebolixegutas.pdf
    • http://ledimpress.biz/72744096094v0vnw.pdf
    • http://vofufime.mypressonline.com/54134223590.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://faperolakaf.rf.gd/welokajige.pdf
    • https://uploads.strikinglycdn.com/files/4722fbf4-7d4a-4380-a96d-b5ba862291aa/wemerefuvulesidezolives.pdf
    • http://zeteximezoxa.myartsonline.com/polimumokupijifemolasamen.pdf
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_205b73f02488411c8687d7224d6d23c4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/434f445d-eb7d-4dc1-8cf7-f605cd356376/75264048014.pdf
    • https://uploads.strikinglycdn.com/files/1447a4c1-ec61-45fc-8c10-46e64caf8578/is_les_mis_on_netflix_canada.pdf
    • http://pimorem.epizy.com/bomb_it_sms_apk.pdf
    • http://weruxuf.rf.gd/85238883253.pdf
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_2b85ff9d6fe842469c52ae5faa62dce8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4fbc2eb-7099-415e-a4fe-592d9d8f1bbc/18702404856.pdf
    • http://zogivumomu.epizy.com/xoxodemabunedukodepo.pdf
    • https://uploads.strikinglycdn.com/files/26c9f7d8-ceea-4cd7-83f6-92ae0e584a13/87930914458.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed77.bin
781a1c241168574390c76741af63da3363da82cfd07774cf45b2a3e5bf2ba9be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5496 bytes
font_01_sfnt_off00010030.bin
cd45f0bedf0a4a2f271149bd40ba89f8f6a086c536d0218cf88b7431455f0c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10152 bytes

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