Malicious PDF — malware analysis report

Static analysis result for SHA-256 782044cb8a9db01f…

MALICIOUS

PDF

81.0 KB Created: 2021-02-28 22:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d433ac996267ac7995890538913bb0ff SHA-1: aed10e58ae60ce6f76c2f04c6e8a58007c490b70 SHA-256: 782044cb8a9db01f9f9825973bbb211554a71e8f0ef63fa7f622bb33e0c462ba
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://jacksth.ru/strik?utm_term=cutting+for+stone+reviews+guardian', is flagged as potentially malicious. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

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://jacksth.ru/strik?utm_term=cutting+for+stone+reviews+guardian PDF link annotation
    • http://duwajofov.iblogger.org/femenikalakawadov.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/echo_srm_225_trimmer_head_disassembly.pdfIn PDF document text
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/7f76fcc73a72e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_6001a4e9ee96d.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/75207931384.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/2fffbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_6009d68f54a10.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/how_to_report_cohens_d_apa_style.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/fejififimaketo/32309025374.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/2019_w_4_tax_withholding_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/bss138_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/why_is_my_wii_light_red.pdfIn PDF document text
    • http://jutefuzu.rf.gd/cryptic_quiz_answer_key_page_42.pdfIn PDF document text
    • http://ziwejozaz.epizy.com/pibexujogomukarorukizizi.pdfIn PDF document text
    • http://tuzepezajofar.epizy.com/81704004893.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/zevetibezap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 5100 bytes
SHA-256: 9c57862910052fdec8680c3b33112b09b3f0c2217d201bd5d79209c88af198d2
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10968 bytes
SHA-256: 9be02aab225ee4c0cd88a42dcc2eed05bf9d5828048b7bf1ae9d90dcc544a5c4

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