Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9913b935b1ddf44…

MALICIOUS

PDF

79.4 KB Created: 2021-03-08 06:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb05af71a24bd554a5462933dba89313 SHA-1: d0bbaa03f9e7e37956f5b38c59ea0ee2aad8960d SHA-256: d9913b935b1ddf444ceec1672a919ae5cf3e71a6a7cc9fc8d524b567630f96d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://nipisod.ru/strik?utm_term=who+makes+the+ellipsis+tablet', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=who+makes+the+ellipsis+tablet
    • https://cdn.sqhk.co/pijujuweg/jijeztT/vamow.pdf
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6026a165d3ab6.pdf
    • https://static.s123-cdn-static.com/uploads/4413969/normal_5ff05b8c2f233.pdf
    • https://cdn-cms.f-static.net/uploads/4477183/normal_601db4ad3c825.pdf
    • http://tipaxoj.66ghz.com/86928149755.pdf
    • https://cdn.sqhk.co/jupujezaxa/nJXiagj/battery_twinkle_lights_with_timer.pdf
    • http://sokelekife.iblogger.org/ninunekazatek.pdf
    • https://cdn-cms.f-static.net/uploads/4417644/normal_602761870729c.pdf
    • https://cdn.sqhk.co/woledibiroju/jeUMQOf/kiko_running_sushi.pdf
    • https://cdn.sqhk.co/jinubodilev/UgQohc8/61537374377.pdf
    • https://cdn-cms.f-static.net/uploads/4424029/normal_602acdf06428d.pdf
    • http://doresal.22web.org/osmosis_potato_lab_report_discussion.pdf
    • https://cdn.sqhk.co/sirijunubi/hbgcHif/free_photo_collage_editor_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/panokojol/audacity_mac_book_pro.pdf
    • https://s3.amazonaws.com/padosumifubobo/78702529770.pdf
    • https://s3.amazonaws.com/pewibim/engineering_company_profile_template_doc.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_84bf64c152ff4b5a99305306f35342c6.pdf?index=true
    • https://s3.amazonaws.com/bomupi/gomewutubuja.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_820d01651ac74cafb2b8c1685b255d92.pdf?index=true
    • http://ruxududomaba.epizy.com/95759877809.pdf
    • http://zetazuzetebutef.epizy.com/xukesoxosojofobilitu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f995.bin
0de5045025c7e62e60459ed327d70590c5cfe32281f94269fa6489bce5d60eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5180 bytes
font_01_sfnt_off00010b14.bin
1d7a03c9fcbe468a9666deae1fae971fb8c54cdfa7012c88f6f2e0c3576eb714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 11024 bytes

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