Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa4f3bc2cb1b6f2…

MALICIOUS

PDF

85.2 KB Created: 2021-03-19 17:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 683f271f29cd979a6479daed15ddb27f SHA-1: ad988bc3266843b613f2de48a10ecda2a0c5d328 SHA-256: baa4f3bc2cb1b6f28db8e59d7fa5a54aaa7696ee96e69c5e70643dc5af9c21b4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=how+to+study+for+ap+us+history+exam+2020 PDF link annotation
    • https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/a0518adf927bb8.pdfIn PDF document text
    • http://kagoxugukata.22web.org/gawakapepugazo.pdfIn PDF document text
    • http://xapilaradagizo.iblogger.org/nuvobobiwageluvatudofiwor.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/6177861.pdfIn PDF document text
    • http://lubuwemobiso.iblogger.org/oecd_transfer_pricing_guidelines_2010_deutsch.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/redefoxuluvigogimetojoz.pdfIn PDF document text
    • https://zifalopo.weebly.com/uploads/1/3/1/3/131379769/90ec304d17676.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/3658831.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/sokutijobez_maforo_xepetotega.pdfIn PDF document text
    • https://minedikatew.weebly.com/uploads/1/3/0/7/130739540/9987904.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/add_2nd_edition_spell_sheet.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/804419.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/65d7bf14f100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_dd77b0845fcf484088c6bd18cd2fc3e6.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/1360247004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740915e9-39b0-4bc6-9469-6a8e35cb4c26/jivugananegurenevojebina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9697cf-dc61-4dd2-98e2-fabd188179b5/mubukusuromegobiromi.pdfIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_4db65b976f60409baa1dc985efe5e5db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed0db0c-28b2-454a-b706-7620d80329fb/bram_stokers_dracula_full_movie_download_mp4.pdfIn PDF document text
    • http://sobupedu.rf.gd/73154669770.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/35957779521.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/lecciones_aprendidas_accidentes_de_trabajo.pdfIn PDF document text
    • http://deravamosu.rf.gd/system_analyst_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31488e39-ab56-4701-a6bb-ce768ccefa2f/graco_pack_n_play_portable_napper_and_changer_instructions.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_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 5744 bytes
SHA-256: ecddb0602faa508783d847c5ccd409c2c4fd37b6692e1dc3b7cf77be2c8c695d
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10836 bytes
SHA-256: a5e36b3184436e4ae82f02735e740f5b16031d1970aa5ddf2e4848c55dca8353

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