Malicious PDF — malware analysis report

Static analysis result for SHA-256 a751e3aef348a65f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 15:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 040aaeb1605f8c0a0a6f04fd6496bb4c SHA-1: e8a9a3dfaadde3084d3879ececd7c48278fc28c5 SHA-256: a751e3aef348a65faa9be80c9438476df69f1c07b0fbb159218fa9b75b80dedf
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=las+par%25C3%25A1bolas+de+jes%25C3%25BAs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5fd9b274bb014.pdfIn PDF document text
    • https://cdn.sqhk.co/zopezepazedo/iIXjbYl/birdies_cafe_baraboo.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/dYgcagc/buginajiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6011420b1857a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fd89c8a46f57.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/iihiwia/76904765475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_600e014526cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/ujcCigt/difeta.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/CUigdjd/truck_wallpaper_4k_download.pdfIn PDF document text
    • http://xovoposinakok.22web.org/manual_de_supervivencia_colin_towell_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_5b272fb019884b2cbf497b2d7163ef58.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_80e7f5db33044d78b9b6d9876fed2cf2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/german_shepherd_puppy_images.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/training_certificate_sample_template.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_2646ecbf1838483c8fa05b0532f610df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/gafulirutilolipanise.pdfIn PDF document text
    • http://zukisofom.epizy.com/bebalorokosuxugerune.pdfIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_45cc9f9b9ff94252972deb6350e6b2c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/73165124388.pdfIn PDF document text
    • http://gaditimotef.rf.gd/68594442069.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5540 bytes
SHA-256: fcdccd0cd70cb060f65cc21f11155e5c6946d57274ec58e052cfe78dac8afc1f
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 12076 bytes
SHA-256: a35258874e1f889f9142c913fc56edd17f5de5126ebdfbd05e11271aa6658392

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