Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9f8f891fe3cfc3…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 22:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c233f5b04487ee9756d44e2d5592e1 SHA-1: de383328062ae5deb427204a0f0d2a4678f6a52d SHA-256: 9c9f8f891fe3cfc349d40b79f64fe557cdf8d23168467b2ea4ec5ac70910f4b8
156 Risk Score

Malware Insights

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

The PDF contains a link farm and a suspicious external URI, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to lead the user to external malicious 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+much+does+starbucks+barista+pay
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/3029943.pdf
    • https://xuxudufekew.weebly.com/uploads/1/3/0/8/130873992/5134092.pdf
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/7680896.pdf
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/9b477c95936.pdf
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/kukupovumuxometa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_3b17dafcad3c4cc6880ede24fab542df.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af5fa021-8a96-49c2-abd0-9662f9566d35/z_table_statistics_calculator.pdf
    • https://uploads.strikinglycdn.com/files/318ece39-e627-40fb-a971-d0b5c92d8abb/245374891.pdf
    • https://uploads.strikinglycdn.com/files/5e8b624c-05b8-4469-b95e-7119e38ef63a/xuditolasoleve.pdf
    • https://uploads.strikinglycdn.com/files/53a8a230-5942-4d37-8ec2-a4357e438f79/wiroguxepotarikujinu.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_6a9ab725ae084c21ae1240ac2febbe39.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb0fcf3a-3f90-478f-859d-eff5bf262488/34845935402.pdf
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_029afc80e50b4a30a7803b7a29423242.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56aee584-6bd6-42eb-b889-d577c5da28e1/21809603081.pdf
    • https://uploads.strikinglycdn.com/files/2f4639a8-326b-4a1f-b452-1208b31b292c/how_to_make_your_own_lithium_ion_battery_charger.pdf
    • https://uploads.strikinglycdn.com/files/38a1ce38-9a24-447b-ba82-c2fd8353ec1e/guardian_by_petsafe_in-ground_fence_receiver_collar.pdf
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_7916f61d246e4242bd75ff3a70b93c46.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_3391a9ae0eff4597b61c129301c05519.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37764d57-f387-4d0f-8713-6a1facd16ad6/jedagavavatiboriganuzomig.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_off0000e8cc.bin
c800ea9f43097d1b198bb7b76f473df13f0633a3fcab6ae49218e3d36e70e574		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5640 bytes
font_01_sfnt_off0000fbda.bin
73a4d1ed08e92861cfca3d3b33b4d2fe8a2b514c7d28c4c1dffc505530185a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11300 bytes

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