Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c69ebee5fd772f…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 10:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e8ea2f6aef131b726b6381b1f91899e SHA-1: bb4b904dad8aec88d4d0c4069f5a196e9bc96b50 SHA-256: 22c69ebee5fd772f2b099c700fd02defe1f2e3c571c617ef6c35053fc1b001a5
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirection scheme. The presence of URLs like https://jottigo.ru/123?utm_term=how+to+simplify+expressions+using+like+terms and http://bullbananavannaone.xyz/girlfriends_guide_to_divorce_cast_changebs4un.pdf indicates a potential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/123?utm_term=how+to+simplify+expressions+using+like+terms PDF link annotation
    • http://bullbananavannaone.xyz/girlfriends_guide_to_divorce_cast_changebs4un.pdfIn PDF document text
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/ebdf32a0980ee25.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/a3sZbjb/through_the_ages_game_board.pdfIn PDF document text
    • http://kilewigi.iblogger.org/area_of_polygons_worksheet_with_answers.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/convert_word_to_fillable_onlinedslm0.pdfIn PDF document text
    • https://jebilazi.weebly.com/uploads/1/3/1/8/131856389/e31d380c05.pdfIn PDF document text
    • http://copyrightsupporteds.com/libro_de_auditoria_operativari96c.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/muzimovok.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/6571866.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/luworizesupox/windows_10_preparing_automatic_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/biomedical_science_graduate_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/general_chemistry_test.pdfIn PDF document text
    • http://kagapari.rf.gd/39003749418.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/77315540509.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/68287079003.pdfIn PDF document text
    • http://dorofudi.epizy.com/zirivida.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/lasedulilijawulafofereg.pdfIn PDF document text
    • http://regisebe.epizy.com/43222576772.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/mulabileniwewo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/supavefazivo.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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 5296 bytes
SHA-256: c1fa1c631f08251b16205ce4c01ef2ad40097ae1468934d07e81ff4e94c0bfee
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 11600 bytes
SHA-256: 8207577f3ea1b50571d80e2d5cd6774c1f476e5118f69a860d98ead2fc786911

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