Malicious PDF — malware analysis report

Static analysis result for SHA-256 394201fd43fa7087…

MALICIOUS

PDF

87.7 KB Created: 2021-05-20 01:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5afd96f4cb3a0df6e56ba2988876e491 SHA-1: 5c425aac711be56346d6ab54c540111f23bb3d02 SHA-256: 394201fd43fa70876acd86076266e16b3f38017cd0802a8dba70b8f549b9fe55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=compare+and+contrast+the+secret+life+of+walter+mitty+book+and+movie PDF link annotation
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/cf9bc64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_604a9b49add95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_601bf2fcb902e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_606ae68d1c1bf.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/taxivuxo_vixaw_pegolewatifu_siredewitoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600a507acbe0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6042e5d7bc17f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_603de0669ab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fd1569669aeb.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/aaec0a0b3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_6055bdba4261f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20d13fd-b1d1-4ed4-9d01-4e8f0fcd4078/wevegiwevigusufonodaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3d71c5-d9ce-4744-a3e5-031bda64e713/29721834546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6390f31d-59c1-4307-992b-542d27afbdda/93421848151.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/the_black_cat_comprehension_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aaffa5-7975-47e2-a2f9-f3c7674ced4b/94348105284.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/wefujakisusobukovus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 5760 bytes
SHA-256: 2dd3453f541824e9d8c7b4b2e822a57f71314b9a35e57ee79bafe8aa8a8fc210
font_01_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 11512 bytes
SHA-256: b108c3e45429f699724e5826af102fd3b125fab331db18ae5429588c74781467
font_02_sfnt_off00013b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B54 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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