Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff046c4aab2cfc37…

MALICIOUS

PDF

83.8 KB Created: 2021-04-21 16:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 37be99a22d6d0773cd56bb71f3a0094a SHA-1: 5aaa6bceba376873bb05e3b62d7d37c18044ff63 SHA-256: ff046c4aab2cfc37673d45b2770d402569e360b4769735554dcf64830a5f52f7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://vilenefex.ru/strik?utm_term=ciclo+de+krebs+definicion+biologia PDF link annotation
    • http://azules.ru/pogen2nz3l.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/tljcjfj/starlit_adventures_ps4.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/uml_activity_diagram_tutorial.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/futasab.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/UaMyhcF/tuburexodigiwijosikexusag.pdfIn PDF document text
    • http://a-trvl.ru/adenitis_mesenterica_elsevierplmj1.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/heqgfjg/zabeni.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/tadixajotepig.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/8khfgcs/download_race_day_multiplayer_racing_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/bezofusipow/87haXeX/conclusion_template_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hcSPLtl/dc_comics_animated_movies_free_download.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/chartered_financial_advisor_jobs.pdfIn PDF document text
    • http://stnold.com/4990125585830c3e.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/DgeKhho/word_crossword_clue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puvapulugo.onlinewebshop.net/arguing_with_idiots.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/abstinncia_de_lcool.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/subject_verb_agreement_worksheets_5th_grade.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_5beee445c9ab40aeb2a1766d3d614879.pdf?index=trueIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_495f3b43a94a4b6388d2ab92f2b6897b.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/virofuzedewitofugan.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/how_do_i_put_my_maytag_washer_in_diagnostic_mode.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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 5296 bytes
SHA-256: 18d9a4868b755a351da9cc63bdc9c295cf99a907d29df21d5d6b783c4c26845a
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 12732 bytes
SHA-256: 3e97b57a2f8cbf72db9919d398ab7aa5d2d24599c961b7db12ea7097548d3c4c

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