Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd660c5803748e7…

MALICIOUS

PDF

83.8 KB Created: 2021-02-08 05:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 526bb9a03b6f0eef788ba63e7a61c3c1 SHA-1: 70b0baa59c808205185e27962a4c0cefa12fff32 SHA-256: ebd660c5803748e7f7de734fe59745730770933592a06e11387a0625cbde624f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=calvin+klein+women%2527+s+size+guide PDF link annotation
    • https://daluruxixofofi.weebly.com/uploads/1/3/1/3/131398394/7527439.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/e1a689b34c515.pdfIn PDF document text
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/2592168.pdfIn PDF document text
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/2598074.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/wegivimefop.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/puxijewuwegunisusi.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/screen_time_android_samsung_s6f0w8o.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/kuxizerot_zezeviresezi_putokeb_ziweso.pdfIn PDF document text
    • http://help-violation.com/smashing_pumpkins_tonight_tonight_meaninguk5xm.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/fibenabiwonepi9vz2.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/vesakefovo_xulisexumavijaf.pdfIn PDF document text
    • http://artistichomesolutions.com/lavojofezuww1ykv.pdfIn PDF document text
    • http://forecast.bet/faith_family_academy_jobsls4mk.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/1df60509f7d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towakog/activesheet._pastespecial_vba_excel_2010.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 11092 bytes
SHA-256: 3bc0e5f8c22180c07a038673707cdb8b670fabf50a8053d7a1523c810c99de9e
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 5256 bytes
SHA-256: 5a8edba3f0191a08cd6942ce63792e712a05ad279d317870f4f711cf25b07d29
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10304 bytes
SHA-256: 10e7a2f1c66614160df213bb5eb7b0ffa17d1130befc797409b96bf05188073a

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