Malicious PDF — malware analysis report

Static analysis result for SHA-256 8950412c2f9974cb…

MALICIOUS

PDF

89.7 KB Created: 2021-03-15 08:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 43cd272c02a46db0a5e388043c0fb450 SHA-1: 98a67e77e2098ca2d1b3eec04e48363d1bf54f38 SHA-256: 8950412c2f9974cbee8501072f3a2f9ba020830b482b1cd23ac94bc0e59c8670
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=emotional+status+video+free PDF link annotation
    • http://pofuxubilet.sportsontheweb.net/71714987427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_6037451d94d34.pdfIn PDF document text
    • https://xurigaral.weebly.com/uploads/1/3/0/7/130738792/fifiribe_rovigozox_fudesexa_vufazaketo.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/2676508.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/salabipowegobofel.pdfIn PDF document text
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/6076569a4.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/73bfaa6582.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/95375628880.pdfIn PDF document text
    • https://fiduludebiwoki.weebly.com/uploads/1/3/4/3/134317875/kosixozeguxevagovito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5fcef7f88cd45.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/1700341.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/associated_press_stylebook_2020_and_briefing_on_media_law.pdfIn PDF document text
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/janageguse-tusivetu-sogixiwox-sifukela.pdfIn PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/f9a5980a8fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_601b1ee5b858a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_602b9916a3b5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_b7a5e99a69424686bf40d0f733f50ff0.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_f4a4a72d9ef244109f0e02e89ed2d090.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_5f2df0d7c8fa409ca88801434f6e3f70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/aankh_mare_song_dj_remix_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/holmes_hepa_tower_air_purifier_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/wapking_song_bollywood.pdfIn PDF document text
    • https://c0128b47-9b8e-480e-8e39-154c9fc9162c.filesusr.com/ugd/b81754_a0f7df7ab96f4e1b9f0df3404ee943e7.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/12412694554.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_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 5072 bytes
SHA-256: d8e6ff95b03ac7df3389ed46014dc5e48d4144e25e3042043ad27952eaeddccd
font_01_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 10196 bytes
SHA-256: bb1e90d4b375ee62c393878845f325f5b5dae2bee3f43d70ff2d22c89c4ee362