Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3862e7f9a78364…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 07:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7c20dcabe9814c5d0f0b08b62e2454 SHA-1: 73032569c22c6d5133be3bdc58eb5e98126f6851 SHA-256: 8f3862e7f9a78364c110daec83365e774f45769a3d97fc666ad6fac341fc5700
156 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 PDF files, suggesting a link farm or content distribution network for malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=gravitational+acceleration+worksheet
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fe787d34d784.pdf
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/pobitolapep_xikamub_guvug.pdf
    • https://cdn-cms.f-static.net/uploads/4495065/normal_604ae3afae6cd.pdf
    • http://outputqwvk.space/beats_studio_3_wireless_headphones_black_fridayn8hng.pdf
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fdf339f235e9.pdf
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/7546606.pdf
    • https://mutixuvuv.weebly.com/uploads/1/3/4/6/134665255/8668995.pdf
    • http://pemotutafid.mywebcommunity.org/30079458231.pdf
    • http://theraisins.pro/dafiwezuzowolobiwimoloymf2x.pdf
    • https://cdn-cms.f-static.net/uploads/4409248/normal_6051e829ce619.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5f892a9cdd.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5fd921aebc360.pdf
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5ffa7dbaae0bb.pdf
    • https://gipewiraxo.weebly.com/uploads/1/3/5/3/135334151/meduterizizudagiwe.pdf
    • http://fofiwafajelerax.sportsontheweb.net/is_microsoft_flight_sim_coming_to_xbox_one.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_f5c54a268e0a4bb79e400ca137791f82.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_ebda1e539dbd49abbb79a82df7943b80.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_7c78660fcf1047c6a2ab03f8d5ff0c7d.pdf?index=true
    • http://nufiwimuzobo.onlinewebshop.net/38474811880.pdf
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_49636f2a407440edbe848adaa793faed.pdf?index=true
    • 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_off0000ebec.bin
1e586b890c3202fc39649c8fcaa7897ae02070a7c906ce3d2288a6a5d1d0ff04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 5132 bytes
font_01_sfnt_off0000fd70.bin
0ea056c608a5332afa2d2b63188ce2e37c9d0f9802daf582e4bea8ba5506b710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 11012 bytes

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