Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b862e7e95410fe6…

MALICIOUS

PDF

68.8 KB Created: 2021-03-01 09:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8a1a9eab0224009fd32b51667587e762 SHA-1: 091e77de55776eb81f479b5e10a63711265595b2 SHA-256: 4b862e7e95410fe6f5d9124edaa09df6efa28cdc46bffdeb386ea6eae61ed60b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/award?keyword=how+to+plot+ternary+diagram+in+excel In PDF document text
    • http://trylait.club/amoeba_sisters_video_recap_diffusion_answer_keyn4nmh.pdfIn PDF document text
    • https://tofuxatedev.weebly.com/uploads/1/3/4/7/134706151/raxuzisir.pdfIn PDF document text
    • http://remontnatali.ru/honeywell_barcode_scanner_1250g_manual9fg3n.pdfIn PDF document text
    • https://likuwamagu.weebly.com/uploads/1/3/4/8/134899286/vobixo-pegiro-siwuxiwase-detibi.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/ef88af05cc22.pdfIn PDF document text
    • http:///serc.carleton.edu/download/files/19001/excel_template_ternary_diagram.xlsIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/71447324636.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/man_s_search_for_meaning_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/83326483759.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/biconditional_statement_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/microsoft_powerpoint_storyboard_template.pdfIn PDF document text
    • http://validexa.epizy.com/zosepexe.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/sheet_thickness_gauge_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/heart_and_blood_vessels_worksheet.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_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 5436 bytes
SHA-256: 38787b31d8bebc106de07a87c2b82b212f35d81768909cb7e1c512dbb918e5f7
font_01_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 10860 bytes
SHA-256: c46edac940d17a84c183fe2a3b54ca7109b95324de55c2a4b01f2b25494f4afc

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