Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eef2c84265627fc…

MALICIOUS

PDF

144.7 KB Created: 2021-03-15 04:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45c00bfac957d296b017030b0f80bf9 SHA-1: 38c2f848ca0c307565a361c1e10569120092ecaf SHA-256: 7eef2c84265627fcda8ac5799a78745699b797e5732c18325b929ee949894dde
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as an encyclopedia, which is a common lure for phishing or scamming operations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded URLs. No scripts were extracted from this sample, but the PDF structure itself is indicative of a link farm designed to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=encyclopedia+of+philosophy+and+the+social+sciences+pdf
    • https://static.s123-cdn-static.com/uploads/4383300/normal_5ff70f4ed3906.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fc6b5aee3ef0.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd30f3e5aedd.pdf
    • http://filfex.ru/wozupuu002q.pdf
    • http://podjem2.club/formation_chef_d_entreprise_8wdxkp1d.pdf
    • http://dalnoboyi.xyz/nekurerulajasakebulires5yje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_7217b4db9884451a9e220b137e2a526a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c227406a-e7c7-4087-8a99-d0314debc3d8/naruto_databook_4.pdf
    • https://s3.amazonaws.com/mipeboro/pafej.pdf
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_6a5f77fd19094f3ea0c1ebd54e304ef2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49f22759-d712-45db-9363-b7cb3a64cf8f/how_to_train_to_be_a_secret_agent.pdf
    • https://s3.amazonaws.com/nonipesikiri/sadabikebo.pdf
    • https://s3.amazonaws.com/libowebujakux/nuvoma.pdf
    • https://s3.amazonaws.com/nosepevozux/sales_email_template_offering_services.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_1ab5f743539c4bbdaecd37fc800c69f7.pdf?index=true
    • https://s3.amazonaws.com/rizoli/fizidotamubekax.pdf
    • https://uploads.strikinglycdn.com/files/aca0831e-78cf-439c-81ea-c81a7bacc99d/64349809073.pdf
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_533c947ca5c4468b8c8d777f56f60d40.pdf?index=true
    • https://s3.amazonaws.com/garorowa/cuisinart_fondue_set_recipes.pdf
    • https://s3.amazonaws.com/dugibabafod/what_is_e1_error_in_carrier_ac.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2b22a712ece3492b917ca0b925375c8e.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_off0001fbce.bin
d367f0802e89bf02cea8c005a14aecabb1303f6e3281ee8d531d8d95d58b0486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBCE 5204 bytes
font_01_sfnt_off00020d97.bin
126b6940563dc6ea86784c5d7177f05ec70c64922f7e40efdbaed7b1271086f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20D97 11572 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.