Malicious PDF — malware analysis report

Static analysis result for SHA-256 0990b285c26e291c…

MALICIOUS

PDF

68.6 KB Created: 2020-11-20 19:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6ae7affd4e626b73f4611f21ad0dc8f5 SHA-1: d8d35029508f9271c15fbf7527f910d3a4e064cd SHA-256: 0990b285c26e291c29a42a86694f6ce3f00c27bf55cc9428fb843365d9178e68
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, 'https://trafftec.ru/123?utm_term=birth+certificate+generator', is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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://trafftec.ru/123?utm_term=birth+certificate+generator PDF link annotation
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/6cc96c6c.pdfIn PDF document text
    • https://lafofawevomu.weebly.com/uploads/1/3/4/7/134770087/bapukokegezajutav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8a77dd50e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_5fada71fda79b.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/guvovigo/16121325065.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/cch_chuyn_hnh_nh_thnh_file_trn_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/treaty_of_versailles_crossword_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48257c5e-080c-4768-8b07-cb7925cf28d6/twenty_first_century_fox_investor_relations.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/filewadanamamatil.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/connecting_9_dots_with_4_lines_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/81533637069.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/tuzakuromepewofigifofoje.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/jegexeluv.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/british_council_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/us_presidents_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/carotida_interna_ramas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9463c1fc-7976-473e-b177-bfbdf4546651/stent_retriever_thrombectomy_names.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/cyberpunk_2020_solo_fashion.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_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 4984 bytes
SHA-256: 93de278e875d6e5965b969a43038da4462ac1a7fce67bdfb9bf9f7300912952b
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10088 bytes
SHA-256: 4ee859b34675bc888d02f78a7da5d1a543181e7db5a37e856c5631387bf1c707

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