Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ab280098fb286…

MALICIOUS

PDF

75.1 KB Created: 2021-05-29 07:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02c42975d38cd99de0816e6c85f3126 SHA-1: f1f2791c4197e9e78328a9a156a1f66890918cdc SHA-256: f31ab280098fb286d1d572cb7ce305b574655327f11e05d2a69455620fd8357d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or host malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a potential spearphishing attachment used to redirect users to malicious sites.

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://static.s123-cdn-static.com/uploads/4456378/normal_6008cfe7acb03.pdf
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/tegasaxumopagu.pdf
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5feea9b0eaee2.pdf
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/d089c61fa780.pdf
    • https://cdn-cms.f-static.net/uploads/4481825/normal_602a550a1777a.pdf
    • https://cdn-cms.f-static.net/uploads/4452599/normal_605c0f59de8e6.pdf
    • https://static.s123-cdn-static.com/uploads/4412762/normal_60035dff0e8e6.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_6058e7e0d9274.pdf
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5fcb107e9716d.pdf
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/c355c487d83.pdf
    • https://zezikorerizuziz.weebly.com/uploads/1/3/4/6/134660856/noxefuwi.pdf
    • https://static.s123-cdn-static.com/uploads/4375885/normal_6007dc1c20429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=christmas%20carol%20george%20c%20scott%20streaming
    • https://uploads.strikinglycdn.com/files/f76da070-4732-46b9-8108-995808e31313/explain_how_animals_protect_themselves_from_their_enemies.pdf
    • https://uploads.strikinglycdn.com/files/5d6c17e2-4d40-4b4b-abb6-3d1f45621ece/3632262937.pdf
    • https://uploads.strikinglycdn.com/files/54c071fe-b1b3-4d2f-a702-2c8eb594f1cc/55461282161.pdf
    • https://uploads.strikinglycdn.com/files/286e0a4b-c2a4-468b-a7b0-765c15a75512/zinebevonojomumanemale.pdf
    • https://uploads.strikinglycdn.com/files/b3737347-71b2-4f58-9f0e-ecddba707331/english_sentence_structure_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/ef177511-95f9-47e9-9d1c-ee6ed575294d/best_ride_on_mower_for_1_acre_australia.pdf
    • https://uploads.strikinglycdn.com/files/9f8bba6a-d579-4597-b467-917127345d03/linear_and_non_linear_simultaneous_equations_worksheet.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_off0000e68e.bin
3f7e8c20a4559cb690345688bf91406b8e193bef76a99730352368a32e2b671f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 5116 bytes
font_01_sfnt_off0000f7c1.bin
c7df2cf7af8c7889496e4e3ef61b78f8f645bd7848c82dfe8b23842f02b61931		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 11528 bytes

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