Malicious PDF — malware analysis report

Static analysis result for SHA-256 409c422e9f3bdee8…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 231a9d9d95c1767f85543de6250c6781 SHA-1: c0c0fb85ece40730772f5fe59b22a557c85aa6ba SHA-256: 409c422e9f3bdee85674d8d42074e101f7cafd344278d01dbfa689d57783af52
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=convert+pdf+file+to+word+document+on+mac PDF link annotation
    • http://siwupojotuj.getenjoyment.net/what_to_write_in_a_21st_birthday_card_for_a_niece.pdfIn PDF document text
    • http://wawesoja.sportsontheweb.net/datix.pdfIn PDF document text
    • http://mifilud.iblogger.org/bazolasepu.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/kedoxujav.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/kiwelutozewabivapizu.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/rejajazituvadefaxepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36adc2ba-078d-4623-a520-9f9fbf00fe99/how_to_wear_mask_with_pleats.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_808328887c4a4fc38b54364e4464de46.pdf?index=trueIn PDF document text
    • http://naranosufok.atwebpages.com/anything_but_typical_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ec7f2a-86ec-4124-8158-c638004c9edd/20370071798.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_8ba7fb14cfc443a0a5d50ee1792b6ede.pdf?index=trueIn PDF document text
    • http://pumikowexudat.onlinewebshop.net/astm_a36_plate_specification.pdfIn PDF document text
    • http://suxuzodezojoni.epizy.com/knowledge_encyclopedia_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61823207-d1db-4548-b764-80ca75cb35b4/vujiwibipatatit.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/valexujidajusezubanofudan.pdfIn PDF document text
    • http://tixinova.rf.gd/mowajufalaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060af79f-df05-4120-9bb0-bab828ddf571/28393714497.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_e73393578c10447987a9eaa423ef92c9.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/definition_of_pestle_analysis.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_3e9c51addbb948a7947dd8ca6410ad8a.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_b9f95c6e440945b3b177f413ad610e81.pdf?index=trueIn PDF document text
    • http://nawevuf.epizy.com/80194266426.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_0e6580533cb147c0b0da62419c7698bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c952d0a6-bb02-486f-a9ca-ff82c40512b8/how_to_remove_baby_einstein_jumper_seat.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_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 5180 bytes
SHA-256: bddccf5c17dcbf47987049ea0ffbd01313bd70cd87ba296459c06fec21118fac
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10816 bytes
SHA-256: 1b361be19f01a5796b39c54ca37390e7ec84a05e7ea9c1f91ee1ffc61346fe83