Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8b82a711f4e28…

MALICIOUS

PDF

93.4 KB Created: 2021-03-05 23:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4dac51e276b420f18e1ebb9d85d6b4d1 SHA-1: 28f4e003c4b6ade4813b293f1a3dcf2960f0b3b3 SHA-256: 8bc8b82a711f4e28f3281ee8c586b8a69de4a01d800d2fb415e6f63245e29a4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being 'https://seumenha.ru/strik?utm_term=what+comes+after+percy+jackson+and+the+last+olympian'. This suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/strik?utm_term=what+comes+after+percy+jackson+and+the+last+olympian PDF link annotation
    • http://fortuneo.biz/james_baldwin_death_of_the_heartbo23c.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/pagaxumarikonoxa.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/4950777.pdfIn PDF document text
    • http://trynutra.shop/807743292880e35k.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/9894895.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/funilegoguta.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://s3.amazonaws.com/xufaxoferugod/91936658473.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/edgenuity_answers_biology_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b226d3c6-ed66-4ed8-a14f-da291f2c28d1/46930314826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e28198-797d-46b3-b9e5-84f5d940d627/46211657672.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/29256852151.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/chaplin_1992_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea42fd7-939e-45b1-9988-a53bf24c56e3/stephen_hawking_wife_and_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/construction_company_profile_template_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/bakusapukutaguju.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/mazzaroth_gospel_in_the_stars.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bewebojabe.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/lagu_on_my_way_pubg_planetlagu.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/zufugevisipepiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7336de79-0b42-452f-a5bc-b91bb55aa169/zagavadobafobosaxelomalas.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/brooklyn_colm_toibin.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/can_the_military_pay_for_my_medical_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516ed270-202a-4c1a-a503-b868febd9d2a/4413768748.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/motirixurop.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_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 5436 bytes
SHA-256: 9b48ae51ca15cb574609cf65d39b9a291e1b7a1356b2eb477f0d1e60ad76b246
font_01_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 12172 bytes
SHA-256: 58edaf6a4fb1904814d8cee0145829af501c98b795a4bc279ecc648fd0e4e697
font_02_sfnt_off00015960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15960 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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