Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01b24c7edc200ff…

MALICIOUS

PDF

80.4 KB Created: 2021-05-18 19:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e2e8ada925a1de68534d049defff057c SHA-1: 23c25dc7165aa44f33be80428c5e7f7105a6a25d SHA-256: a01b24c7edc200ff1b6b4c24a4d63d2e7e2f3b971527d6d4dbc68c6901925e7c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

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://vilenefex.ru/strik?utm_term=rothco+tactical+bdu+%2528battle+dress+uniform%2529+military+cargo+pants PDF link annotation
    • http://bixesifebara.iblogger.org/tanibixudusazojisebizari.pdfIn PDF document text
    • http://nowatora.22web.org/cloudformation_template_vpc_example.pdfIn PDF document text
    • http://pegixudovojap.iblogger.org/manepifemabas.pdfIn PDF document text
    • http://fodulil.iblogger.org/project_management_risk_assessment.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/sekeliniza.pdfIn PDF document text
    • https://domufebulas.weebly.com/uploads/1/3/0/8/130814286/520753.pdfIn PDF document text
    • https://numazerezawikar.weebly.com/uploads/1/3/4/6/134618887/29862b9f226d2.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/nadogajogoj-sakewajobijo-bipar-sudilopidowup.pdfIn PDF document text
    • http://rojemop.iblogger.org/dowiziwavanaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xejotapawadi.epizy.com/hamilton_beach_rice_cooker_and_steamer_37541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd57a4a2-87bf-45a8-98c3-2ede9a0df6bc/xijef.pdfIn PDF document text
    • http://nujowizuwumug.rf.gd/bolbona_go_r_konodin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fec15e-21c5-41e5-adff-8c22260179c5/sahih_bukhari_book.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/30474038815.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/xerijevugaxu.pdfIn PDF document text
    • http://xeladijigaw.epizy.com/epson_xp_820_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0cc2c2-d10e-4c67-b60f-c89600a23b8f/piluvurapamezop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8cfc27-5b51-4323-96d2-82c34171adfe/lowemojagobotiridoreniwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ece270b-5345-45b2-9747-e24b8f60b565/ge_fanuc_90-30_programming_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e691ad9-e19b-4283-a511-86944773ed47/ruwovurup.pdfIn PDF document text
    • http://jizivaj.epizy.com/15938407084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ff076c-46ca-496f-bdd7-4ae46d86f1ba/american_literature_classics_top_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395c7329-c4ff-4fa5-8a46-f17f5f3e228a/sitobatuze.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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 5972 bytes
SHA-256: 1976c6c4f9acf0ed9d086b4977b5b6d3a0b814d3eeec010e3125d8a45ede1323
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 10464 bytes
SHA-256: 8df162dde03f265b877baef07b53bee76c04b4c47eb3556191be1282d222d877