Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8d031e5bbdd258…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 09:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ad1cd0a129a7e22c01552cf3a5486c2 SHA-1: c95a686094edfc65623cdafc3192a9d2952f523a SHA-256: ab8d031e5bbdd25895ceb58852a28ab02093b612099aba7d875e1143dbf2a550
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/wix?keyword=application+of+geometry+in+day+to+day+life PDF link annotation
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/297289.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/how_to_do_works_cited_for_internet_sources.pdfIn PDF document text
    • https://cdn.sqhk.co/roxirali/4r4QJha/anglo_assamese_dictionary_software_free.pdfIn PDF document text
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/e4d1ab05a9ee3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/wijenipa/fhiAgcZ/dixunimodiravozo.pdfIn PDF document text
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/jalafalameve_soronebawozideg.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/1787715.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/sumedowuzeb.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/danim_wiwesika_karuxutejokugit.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/6bjgPMR/54991985430.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/6836418.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/2007_toyota_yaris_sedan_yrs_for_sale_pennsylvania.pdfIn PDF document text
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/3022331.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/cauda_equina_vs_conus_medullaris.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/5318908.pdfIn PDF document text
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/sukuto.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/jgZORii/notirezukozi.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/7798202.pdfIn PDF document text
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/mojedew.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/safosupelagoxoxo.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/murulawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemileti.atwebpages.com/52489587628.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_8bc2808588c44e6cae5b11938ce08ffa.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_a6408125e0fa4541b233ff6ede1087a5.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_81f562c3d29e4ad4a0f0592dc4f422e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5388 bytes
SHA-256: 567227cd2d27aa25d21e07813e61430742980043b26247c959c169673ae3c5ae
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10716 bytes
SHA-256: 8add27e8b9d705a552a7d87dc728dc37cff6ea3a4958b4b6094c6b2eb7c6893d