Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebc2bb4e412adf1…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 11:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0622b641821ef71a6f9e3eb43591dd3 SHA-1: 25028429cd1aeb2e9c6cad03700b8c23c11cb6ed SHA-256: cebc2bb4e412adf1612a0c43c4c638b42c3b7a54e68584338d1378076da61eeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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.
  • 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://resalured.ru/award?keyword=abrasive+jet+machining+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365608/normal_604d9cbe3b7a8.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/e8jdhiC/kejipovux.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/ijgfgjL/zixolefupodefegerogufasus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_6034fd8f2fb37.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/how_to_program_suddenlink_remote_to_onn_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_602945fed2118.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/HnjfgJs/luxor_deluxe_game.pdfIn PDF document text
    • http://futajef.medianewsonline.com/what_does_a_broken_horse_mean.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/61938778480.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/kagawetivufitu.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_a6c66041e3514598bc37e5e0746865eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/sofutitazowolapafiw.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_9de8c3e373e64cebb488172541d7464e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6666f39-a7d9-41db-a652-bd0ad6b4b7fb/is_hp_officejet_4630_a_laser_printer.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_6119c00436a147e99caf133a2318430e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/226caa9e-69f4-469f-9884-d59fd718f6ae/how_to_replace_a_2_wire_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c86ead-d570-405d-b2b9-f93f70ac80a5/twilight_4_tamil_dubbed_movie_download_isaimini.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_380a9d9443a842e48292ab9f53d164ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/first_alert_carbon_monoxide_detector_beeps_5_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4c26df-4d56-4a76-a63d-2cb3cba2fab7/fapepovepiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2320459-54bb-4d92-a4ab-927c380bb80c/tadusolenudapuzuvadeni.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_ec64775a79474b079f31b4e81e7200f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/sefifededofijig.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_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 1884 bytes
SHA-256: 051b06183f80a50b76dc73f610f9c807c708f359a1aaa90f438a7f144d1ce5e8
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 5924 bytes
SHA-256: fac83eac02d0d71275b1b97ffa67272399ed6030bfada6be304de2e4c2cbdf90
font_02_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10684 bytes
SHA-256: c243cecb6719d9f2a80f634d7168c54a77b6642d7c5d3942cf1b1126c8528620