Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c96abf42816772…

MALICIOUS

PDF

84.6 KB Created: 2021-01-02 14:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 212acfe45cfd279b0d9a5cc1fdd27370 SHA-1: 4a4f3ff964920ba0f816f015fc51b383810ad28c SHA-256: 27c96abf4281677296d5647b3547bce83a61b0f8d097b6da7809d64c894cf05f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and a large link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the primary attack vector appears to be the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=apprendre+anglais+rapidement+pdf In PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/roxejesuzenenowed.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/jghdiiD/dragon_quest_11_walkthrough_jegged.pdfIn PDF document text
    • https://pikofejuja.weebly.com/uploads/1/3/4/4/134478885/4494808.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/xaxedij.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/bd9f4.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/goneduzum/oldest_art_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/95627379590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6afccc6-c6ca-46be-a076-899e4087a28c/who_invented_the_triarchic_theory_of_intelligence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dcd92f-7711-424f-8c7d-cf850bd2f292/44994257911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e90e411-eac3-4c8b-b4f6-3dc7f27dabe6/rixejesad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20cf3c61-9925-4061-9a57-982ecb735485/27140150796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9431d9-c00e-489b-99cc-61b1d0bf5549/judy_blume_forever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7129cfb-115a-48db-bf01-2536645f1f8a/nordic_lodge_buffet_boston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46baee85-6f9b-48aa-a8d5-cff9a78e0162/46038734081.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 5348 bytes
SHA-256: 8909c9b331bacb5bc65fa96c75bb8390f0fee38c449eba13caee81a7b5d29586
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 11992 bytes
SHA-256: cc99a9d9730f9fd82b6ae803344d89422f6eedf8b161e5d94e63336a6d8b7820
font_03_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16364 bytes
SHA-256: 5fd320923b42c9d1073d869ed7ded90bba7ca37ff98b8f7dbc3be5a36c4beff9

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