Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b53dea90fb2272…

MALICIOUS

PDF

75.5 KB Created: 2021-03-04 23:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8a555869e5a109ffe5153cbb71268a04 SHA-1: cad395d62c6a216899de7d888dc4650089929a63 SHA-256: b0b53dea90fb22724d959be95c2623cc8a51c5b72dca1185e86cb6ac8c9efa71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' which is associated with a potential phishing lure. The document body, though heavily obfuscated, suggests a theme related to children's songs, which is likely a deceptive tactic to mask malicious intent. The presence of multiple disposable hosting links further supports a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=canciones+infantiles+para+aprender+ingles+con+letra PDF link annotation
    • http://ptmonline.ru/96160115682ouwq8.pdfIn PDF document text
    • http://coolmag.biz/312736279523fcqf.pdfIn PDF document text
    • http://consequences.space/wulukagovugrhuy.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/how_to_get_a_bachelors_degree_in_information_technology.pdfIn PDF document text
    • http://gbo.guru/what_is_pharmacology_class_for_nursests7fa.pdfIn PDF document text
    • http://gnfcns.info/adventure_time_city_of_thieves_dailymotionxfpox.pdfIn PDF document text
    • http://buytoday.cc/61408494579ue6eo.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/is_an_ear_thermometer_more_accurate_than_a_forehead_one.pdfIn PDF document text
    • http://vk-settings-change.online/17089992135vgbvn.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
    • http://jeleruvimubag.rf.gd/goldstar_over_the_range_microwave_stainless_steel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fea386d-58b3-4b65-b929-e498a85537f7/what_are_the_business_analytics_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56840fd-9b80-42f0-b75e-802030b0c424/evh_5150_iii_100w_head_review.pdfIn PDF document text
    • http://vibulowivez.epizy.com/capitalization_and_punctuation_worksheets_for_grade_6.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/83106026488.pdfIn PDF document text
    • http://rutuvofogiseba.epizy.com/john_rawls_veil_of_ignorance_youtube.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/zegaludojuxizigedetaral.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/leropebosexatodivobazija.pdfIn PDF document text
    • http://tipunogat.rf.gd/8137824426.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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 5132 bytes
SHA-256: 83c68ac5f2e55e18fdbd30e30458147d64a26ff3147dc3ecd140af2b054bbc66
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 10940 bytes
SHA-256: ba8511d4214b0120d1f11fdeeef5095611a88e738937d03ffa21598d69555e22
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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