Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f91c0836e9e975…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 09:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8578c27ce293acca26498ed5094449e8 SHA-1: 452e9cdec8c1fb3e8c1c3affcdedba3ae4c99b88 SHA-256: 97f91c0836e9e975afa4a7fbf7eabe2287deffabfe6ed2035b111efa78506bb6
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains. One of the embedded URLs is identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites.

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.
  • 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/wix?keyword=junie+b+jones+aloha+ha+ha+book+pdf In PDF document text
    • https://cdn.sqhk.co/vavegewumur/ejhhf3n/xebinutoninilagalidunapo.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/1341409.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/o92TgiZ/48354851954.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/hhbhhje/easy_to_make_cupcake_recipes_from_scratch.pdfIn PDF document text
    • http://rixugogalide.22web.org/donibabefituve.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/idgcRgf/3d_pool_ball_hack_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/eghifgj/pixel_car_racing_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_6018a4f90a092.pdfIn PDF document text
    • http://pumeputokamodo.22web.org/loxewojavopulis.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/4256468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_6008c69f7313d.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/wukevirenesu/how_to_turn_my_picture_into_an_avatar.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/61010416997.pdfIn PDF document text
    • http://tuzodunewawet.epizy.com/coacervate_lab_answers.pdfIn PDF document text
    • http://petikagemejol.rf.gd/jujogasofepatuwab.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/niwebulutudakotore.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/el_cero_absoluto_cecilia_von.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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5304 bytes
SHA-256: 4f0178200fd799e42898e5d7618b0842c7ec131fe1011744829d0fa09dd9d073
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 13560 bytes
SHA-256: a1d40759a6ee37705d0ec3d0e4a4b3b6a5505fe17a6f716cd0beecabab3c909e

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