Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b75e3fdfa5fa630…

MALICIOUS

PDF

69.9 KB Created: 2021-02-25 13:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d701c9f0cf5f67847e6f8e9617520ff3 SHA-1: 9ef758b1200d1fb7c23a082aeb28136f87183c32 SHA-256: 9b75e3fdfa5fa630a76a48e77aab50469fd8b92a713748d25c66489404b578c6
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 SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=norton+introduction+to+literature+12th+edition+pdf PDF link annotation
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/jakub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd3b2c99408b.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/7fdddfb38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_601043d073ffb.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/fanewasidokesupep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_60224ae35f324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60373107853f2.pdfIn PDF document text
    • https://kanapikimafu.weebly.com/uploads/1/3/3/9/133997195/84243.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/numafaweleputulog.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/what_is_socio_economic_development_of_a_country.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/nunelanejevevalikesigub.pdfIn PDF document text
    • https://xolufoxe.weebly.com/uploads/1/3/4/5/134501271/fegujazuneluso.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/shadow_and_bone_netflix_trailer.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/vonuxagupeduze/xazonozoluwipefubexelixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/odia_new_movie_dj_appu_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/44381126227.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/patusazevi.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/john_betjeman_collected_poems.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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 5220 bytes
SHA-256: e57de4c9eb9b47f6e82df826362448b9424c67fc4cd039b8b3cf279c31c8cfda
font_01_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10676 bytes
SHA-256: b86812cfc7226626f7773e10efcd1dd4f4eab5b31fcbe63b4db2950d736c933e

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