Malicious PDF — malware analysis report

Static analysis result for SHA-256 b606497b07985f13…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 10:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4cdec8624bcf2bede45239d42ecbdaf1 SHA-1: 8f0aff64a65def1f2c3a538b9365d9a8eb846224 SHA-256: b606497b07985f137cbb5165346b9b19df271b5ce4b04580377bc4cee4046f5c
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the links and the heuristic firings suggest a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=best+cyberpunk+2020+campaign PDF link annotation
    • http://getcreditreport.info/netgear_prosafe_16-port_gigabit_ethernet_switch_gs116y42ue.pdfIn PDF document text
    • http://sportplays.ru/vajiguniwapeziwazibod8sld.pdfIn PDF document text
    • https://xosagosogasimaj.weebly.com/uploads/1/3/1/4/131453054/tarepetufero_jaxivewuxana.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/79a98227963.pdfIn PDF document text
    • http://milafikolume.iblogger.org/latest_hd_wallpapers_for_laptop_free.pdfIn PDF document text
    • http://jizefuli.22web.org/the_secret_scripture_movie_trailer.pdfIn PDF document text
    • https://jobozisibipiw.weebly.com/uploads/1/3/4/5/134581899/9086498.pdfIn PDF document text
    • http://pigozolifafaw.iblogger.org/puzesox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemerolafun.epizy.com/pudevavukegesisuxen.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_bde3040f6ed944b0b9c610ed8da77287.pdf?index=trueIn PDF document text
    • http://runozozupegefo.epizy.com/mafegigufepiku.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_941fc78480ef4549bd7ef01729e91e52.pdf?index=trueIn PDF document text
    • http://sapidobilebag.epizy.com/nozobugugasunujivim.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_0304554d3f6d42579b9b120c5ff927c6.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_dcdf5a9a9f094c9f9765af8bc25f8258.pdf?index=trueIn PDF document text
    • http://denefarow.rf.gd/lista_de_comida_para_diabeticos.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_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 5852 bytes
SHA-256: b2ea1aa193a950dc163d736ecb87535e2eb01d949916abd7df28607153c27115
font_01_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 11440 bytes
SHA-256: 485fb913471b85763bd468bfe187d02a75bc3c660c4a43e55c0e45027b546961

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