Malicious PDF — malware analysis report

Static analysis result for SHA-256 10716be375f7f8d9…

MALICIOUS

PDF

89.9 KB Created: 2021-04-04 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa8b817a3fc0917aa06787eb571fd732 SHA-1: 02d8e2de32374b459a3c72951e8bcb1b82f748f2 SHA-256: 10716be375f7f8d902efd774089358a5b9a2b68436e11193216f5fa75f2bacd3
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse for malicious purposes. The ClamAV detection and ML classifier strongly indicate malicious content. The embedded URL and the document body text, though partially corrupted, suggest a lure related to educational materials to entice downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/award?keyword=english+grammar+pdf+for+competitive+exams PDF link annotation
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/dedako_juvidifaniki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6000f80d6eed9.pdfIn PDF document text
    • https://xitesinunupur.weebly.com/uploads/1/3/4/3/134318791/saluguga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_60535ec0429ae.pdfIn PDF document text
    • http://walawabijuver.22web.org/67907402198.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/folexapurilowe/science_of_creature_design.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_d3c34a9bcb50457caab925dd47254cd7.pdf?index=trueIn PDF document text
    • http://xewowibaxe.rf.gd/adobe_acrobat_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e42e7a-49f8-42a2-b9c9-1d0025a18059/nirideko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03701dbd-7d2d-4da5-881a-5798b8c60443/80247538174.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/rijosevalitezuxavatowi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/ahmet_cevdet_paa_tarihi_cevdet.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_9a0280928573466e9d2b29c3225af222.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e228841-9440-4482-9b27-a62bb655559b/52523057771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a22d387-87e1-4042-8e45-138d84579318/slow_motion_video_editor_app_iphone.pdfIn PDF document text
    • http://tokiroxipodi.rf.gd/643694815.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_2f95df3df3674e999f91ff8eff687de7.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_1c450dbbea1b450c98ef2316f935b806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/89272660175.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_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 5652 bytes
SHA-256: ab392200f059b5e080e2fb44e03e7c90774792ea23a31c7216f0d63cb4422ace
font_01_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 13324 bytes
SHA-256: 69d5fc005fd165c15106d5f342186d13e437cca41c0c3bc0e3e9ded0aec48c15

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