Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc3bc87db6c4915…

MALICIOUS

PDF

99.3 KB Created: 2021-05-05 14:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 390d5f9303b175b819e4267ea147bea6 SHA-1: 9bcfeca9b8b8b8107c0da75e96f0ce0d1a6111d4 SHA-256: edc3bc87db6c49154d555691133a898aefcfa4d8bdbd82029646eec442aae3ff
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 0.9995

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://nipisod.ru/strik?utm_term=ms+excel+2007+formulas+with+examples+pdf+in+marathi PDF link annotation
    • https://cdn.sqhk.co/joxipadij/AYLiaKz/zombie_city_survival_war_mod_apk.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/kuvutixisep-somoweg-delixuxeba-kigakoxivov.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/Kcheja6/vmware_horizon_client_5_multiple_monitors.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/ijqjgii/racing_smash_3d_mod_apk_1._0._15.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/drowsy_maggie_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/fgex2Yo/great_keyboard_fonts.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/gfyaHgf/skyblock_hypixel_tips_and_tricks.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/1817335.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/around_the_world_in_80_days_summary_download.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/PhFXiic/lazixevudeti.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gidGghO/sukapijabunadozizilavegig.pdfIn PDF document text
    • https://cdn.sqhk.co/nudofarus/8Vfgijb/wwe_universe_offline_game_download.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/dinuxo.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/2185133e-fd36-4dda-8b31-c2ce82f6b9b5/85015834115.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_609d3bbd2d544410901d2a57d4dbc2e9.pdf?index=trueIn PDF document text
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_6844bd83b4c0404cbb84bbfdf868ec99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3435357-3aab-460c-adbf-20e5360052a2/21675943297.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_bea2c986f7fe4e23a5bf876649456b73.pdf?index=trueIn PDF document text
    • http://gekolutewubel.myartsonline.com/buwawebitalupabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498c6fcb-ecc1-459f-b0cb-cbae354dc448/how_to_tell_baby_gender_from_ultrasound_position.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_cfbd9531e3ee4cd196f6f9b2a325f222.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 5912 bytes
SHA-256: f714883e0fb59afda4bfd6f5fb6b901dc56855c1e475b7ae90566e45dfc30443
font_01_sfnt_off00014325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 11252 bytes
SHA-256: 2f7dc1ae06d1543fa3b22bcb4cb603a3459d7bb222b6c60667563e28120070a4
font_02_sfnt_off000169b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B2 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6