Malicious PDF — malware analysis report

Static analysis result for SHA-256 c845d5583dbf4e8a…

MALICIOUS

PDF

76.5 KB Created: 2021-04-16 03:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23966523d57c2215f5d97a90df4b4e72 SHA-1: f8186335ddeb2b6bf9cb24de01ae2590eaf54149 SHA-256: c845d5583dbf4e8a3b4b7c592bdb9ee0568c8d969dc3ab934cb25bb18c3af3c7
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect users to potentially harmful sites. The document body's text, while garbled, includes a lure related to 'New free wordpress themes 2020'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=new+free+wordpress+themes+2020 PDF link annotation
    • http://jumpfs.space/14188249436wdtlp.pdfIn PDF document text
    • http://hookup671.site/57940776552rdtr5.pdfIn PDF document text
    • https://betutinixe.weebly.com/uploads/1/3/4/4/134481053/kuvuwuvuf-xumikufu-sarakexam.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/anatomie_de_l_appareil_genital_de_la_femme.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/xogegabu_naxanakejux.pdfIn PDF document text
    • http://checkmycredit.info/jabra_Bluetooth_Mteri_Hizmetleri_ts7ild.pdfIn PDF document text
    • http://lojotiwutorolad.22web.org/66847779829.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/66243136048.pdfIn PDF document text
    • http://fowevuwakit.22web.org/widikasazizava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogowiv.epizy.com/energia_eolica_en_costa_rica.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/jetubalelodevuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0b13e1-cb3e-407f-a038-31ba1eba03e4/can_i_use_my_phone_as_a_remote_for_directv.pdfIn PDF document text
    • http://gasigigi.rf.gd/resize_mac_free.pdfIn PDF document text
    • http://xewaxal.epizy.com/91436716819.pdfIn PDF document text
    • http://dugerem.atwebpages.com/entrepreneurship_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6678e9c6-17fa-41e7-b311-c5788e9b550a/sosunazukud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9748ea5f-8558-421e-9532-ee9392b2d70a/behringer_xenyx_x2222usb_mixer_with_usb_and_effects.pdfIn PDF document text
    • http://dukerorute.epizy.com/bejekalipefixofajumu.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5376 bytes
SHA-256: 4d47ca7b172353117714d9ce2b83803dcf7f0c0444fd3c62d9eb88cd19bea4b3
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 11016 bytes
SHA-256: 7ec4eae0251cdbac68452cbbf9f8cf546cbbca13f7c7fed543cb30543400bf8f

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