Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccbacba9e2c2bb9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-25 17:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad28be0c2c0e49ef22da9383f58a63e8 SHA-1: d8571bcaa349ac6333d1f6398c3068423c71ee2d SHA-256: 1ccbacba9e2c2bb93570c38db62d1f939b44998dfd8cee89b3c1c0a465c44aa3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/123?utm_term=kidney+cancer+canada+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387033/normal_60237fab15c9c.pdfIn PDF document text
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/poxofidovuneguj.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/2266289.pdfIn PDF document text
    • https://kedasolusezobu.weebly.com/uploads/1/3/5/3/135394891/jumagetidinapevafaji.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/3993802.pdfIn PDF document text
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/a944da4107c84e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fe41391c0e12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5fe4f5e6bc885.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/kixubap.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/pisik/52915320638.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_355f4709c3f64db0ba64a2207f345e1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/jevuvabujugezufaxorow.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_f94ff52ee80345a78d4c651a1782d765.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67fe6bf2-f5d4-4814-8793-e9e3638b3119/software_development_cycle_agile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e66e8c-0501-4856-9f70-0fcc5813cfec/what_is_model_3_track_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/58738948937.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/what_is_the_electron_geometry_of_co2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f07a09-596b-496b-8f4b-f5f4ef870345/11905964352.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/nadow.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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5180 bytes
SHA-256: 44a53b055f08a9555a229ee7ee5f5193dd47975ec69f4daca7cb1c795b0bad0d
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10680 bytes
SHA-256: c85ce1eeff50a40774058c2f55f5e826e63ab15bd444915717d92c4fe9723398

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