Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11acf68e28d4c80…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 14:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8eb9d043bf196237b47e7ec0596f1593 SHA-1: 28535b664dccf9198393d11b262d3ab8076c0e4a SHA-256: a11acf68e28d4c80251d18e8537c5bc28a373a707e3c7a39db06793194304ee5
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 0.9961

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://dafemum.ru/wix?keyword=atomic+structure+and+the+periodic+table+worksheet+answers PDF link annotation
    • http://ketijuke.22web.org/how_to_pair_my_skullcandy_earbuds_to_each_other.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/4ac4f3.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/zalumonupoga-tasijududadafi-zusiruxe-zavizudinil.pdfIn PDF document text
    • http://penoligis.22web.org/facebook_page_template_photoshop.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/7522094.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/c84d806ff3.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/bitonefo.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/bosulik-mowudemuvod.pdfIn PDF document text
    • http://lolabarafusiru.iblogger.org/air_baltic_app_android.pdfIn PDF document text
    • https://fetozala.weebly.com/uploads/1/3/4/6/134678703/8ea164cfd4342a4.pdfIn PDF document text
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/f7ceedb6.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/dawafidolesowu_gefowerabaz_pugop.pdfIn PDF document text
    • https://jazelufum.weebly.com/uploads/1/3/5/9/135965355/seniz_buvezamulume_wifawimajezozul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowofar.rf.gd/who_are_the_main_characters_in_the_green_mile.pdfIn PDF document text
    • http://xitirinajeki.epizy.com/23489550616.pdfIn PDF document text
    • http://wobuwikag.epizy.com/unlock_secured_without_password_online.pdfIn PDF document text
    • http://vevurikadi.epizy.com/kisipunezimunipus.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/roxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7460a0e9-0278-4bc0-81f7-035c7165da4b/66303763421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4da812-fdae-4ff9-b32e-606e51a550c9/rarejuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702ac399-dab3-409b-8ddc-e5a49ee529c3/25476636920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd065831-7b50-46b6-bd1f-86d2dcdefae6/what_were_the_terms_of_the_treaty_of_versailles_following_world_war_1.pdfIn PDF document text
    • http://gagarereforer.epizy.com/nigelevujimotawuleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10decdc-432d-4114-851f-0bdcf8bca102/fomoruno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9c8299-fba4-4171-88e9-cb918dca0c40/2020_toyota_camry_xse_awd_for_sale.pdfIn PDF document text
    • http://papewemejivore.rf.gd/40496163344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a3b3c6-becb-4bd9-baf8-1466e11f641e/33432493121.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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5600 bytes
SHA-256: a28de4d154a7beb056c841a92352575bf9af2d9b495b90f5061ba24cb8dc6a0d
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10872 bytes
SHA-256: b74cb9e4b42248039045eaee5436c9d7de4cadd6162259a9026023aa07c6e8ec