Malicious PDF — malware analysis report

Static analysis result for SHA-256 9384a32c40e97bfd…

MALICIOUS

PDF

88.0 KB Created: 2021-04-03 01:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1cf23d370d9cc59a0e9b0a623484bd3 SHA-1: 1123c9f5a2f59cc5806fc58f5ee8ec070810a748 SHA-256: 9384a32c40e97bfd9e8752a2dc2448bc8412a12974c9bcc85d6bd8d817d6a860
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 0.9994

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://dugedepap.ru/strik?utm_term=watch+to+kill+a+mockingbird+online+free+full+movie PDF link annotation
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/6ac06ef3201.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/7634419.pdfIn PDF document text
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/ziketesiger.pdfIn PDF document text
    • http://sevesasineja.22web.org/pugerapisuj.pdfIn PDF document text
    • http://zawugexoj.22web.org/html_style_attribute_list.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/def_mandated_reporter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4d354257-8314-43f4-994b-4737921b64e0.filesusr.com/ugd/3835dd_652d6c81e6ae464294505dcc381dbef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be821db-e538-4e20-a57c-7af6c3f7f3a1/cherub_book_3_read_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/fixosobopodegemavik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b1ba66-55ed-49d7-9825-52fd292e8290/places_in_ponniyin_selvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474bef0b-1b07-4654-8bfc-cdb3cc153de1/67624090512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865e55ad-e36b-4cc3-b5b1-228cba63d31d/the_final_empire_mistborn_epub.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/guided_transmission_media_in_computer_networks_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5884d9-de35-4561-af86-a116e828799b/basic_electronics_components_tutorial_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/99621932392.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_bb11dda3cbe74939bfbbcf04ba0d5823.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/23376111631.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/44783386798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec1fabb-11a5-47c1-a2e5-c117fe8aa3f9/smile_by_raina_telgemeier_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81bfda3-6855-4284-837b-8b46ab289c2d/heroes_gods_and_monsters_of_the_greek_myths_free_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d4c4d8-313e-4c19-9d18-9fe1145571ab/37769561446.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/scarra_twitter_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 5416 bytes
SHA-256: ebc01aef50856ffd417b34833ed316e33e3a2ddbe4003609db6b1afc6f33a3de
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 11316 bytes
SHA-256: 103187e736181e8f0cf9c33266efb6bb0b1ec1a44ffafc632d5f9b36e854015d
font_02_sfnt_off00014435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14435 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3