Malicious PDF — malware analysis report

Static analysis result for SHA-256 586a2462f275289d…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 09:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c15fe26b252ec0949b7e99aca398d34c SHA-1: 73333905c0eef0bbf1be42c58afb0f1fb6f1fb1d SHA-256: 586a2462f275289d3535836640f99d1e727272fe831988cd03a1fbad3c96fbb8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or associated with link farms. This behavior is indicative of a link farm or SEO manipulation scheme, potentially used to distribute malware or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=shakespeare%20poems%20love%20quotes In PDF document text
    • http://about-igsupport.com/academy_stars_starter_teacher_s_book9zids.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/jihaWYR/zowexavijevonexe.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/fibamavujizitefuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/WQejhb2/boo_a_madea_halloween_cast_and_crew.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/1724cbc108.pdfIn PDF document text
    • http://copyright-supporthelp.com/833769511574gpxz.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/h5ibOhj/rogozusevo.pdfIn PDF document text
    • http://akmurzina.com/13724108540v3u7z.pdfIn PDF document text
    • http://esmoney.site/glencoe_mcgraw_hill_geometry_workbook_answer_keymthz4.pdfIn PDF document text
    • http://com-copyrighit.com/ximoxalegakuxudegovirl2nol.pdfIn PDF document text
    • http://technodom11.com/bugsnax_review_igneeipn.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/jbheNgy/52115858007.pdfIn PDF document text
    • http://starkrobotics.org/domimukopajisbl35.pdfIn PDF document text
    • http://love-cosmetics.shop/17087362997b4sr9.pdfIn PDF document text
    • http://wbigs.space/plano_arcos_de_la_frontera9e45p.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/hjhbNCq/civilopedia_6_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 5412 bytes
SHA-256: 250e30281481b8b0d3a2ac4ffd7df0a2edacda34559fdc0a70c95f08b5cc69bf
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10488 bytes
SHA-256: f5bd6bffa4dd931c72fbd3f5b5193e8560bb38cc5890c75ff55df4ba72d1a55a

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