Malicious PDF — malware analysis report

Static analysis result for SHA-256 42081010d26ee188…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 08:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e905fe5fd5009e536cef3bd8b6874be0 SHA-1: 24f6a60e04462a68d81c3193a382d20981040a3c SHA-256: 42081010d26ee18881a90d8104c638a8061d65ef60d6f6a9e3ee978a6db214fd
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that is presented as a search result for educational content, likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • 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://jacksth.ru/wix?keyword=algebra+ii+note+sheeet+section+8.4+answers
    • https://cdn-cms.f-static.net/uploads/4489412/normal_603432fc85b05.pdf
    • https://static.s123-cdn-static.com/uploads/4451047/normal_600541bf974bc.pdf
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6017bc57a8b60.pdf
    • https://static.s123-cdn-static.com/uploads/4383687/normal_6004b05167374.pdf
    • https://cdn.sqhk.co/busanurutar/QkNggUr/mitabutajaxu.pdf
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fc78e833ccc0.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/Khcjdig/achikaps_pro_1._20st.pdf
    • https://cdn-cms.f-static.net/uploads/4484103/normal_600fd5a76c8e6.pdf
    • https://cdn-cms.f-static.net/uploads/4449406/normal_60305f51a86c4.pdf
    • https://cdn-cms.f-static.net/uploads/4425728/normal_601b88f1b5195.pdf
    • https://cdn.sqhk.co/mewedenemez/i2jjjd8/zekodaguzudazupow.pdf
    • https://cdn-cms.f-static.net/uploads/4387817/normal_603583255dfe3.pdf
    • https://static.s123-cdn-static.com/uploads/4479942/normal_6000fefdb7e23.pdf
    • https://static.s123-cdn-static.com/uploads/4418199/normal_5ffb6fc8b0b75.pdf
    • https://cdn-cms.f-static.net/uploads/4404122/normal_6011138a8ed2b.pdf
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fe05227f34c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupuxus/33393622854.pdf
    • https://s3.amazonaws.com/lakadutof/place_value_system_meaning_in_hindi.pdf
    • https://s3.amazonaws.com/jenagubadopi/muzasemesakedamij.pdf
    • https://uploads.strikinglycdn.com/files/271a41aa-65a0-42c0-9b13-bd8fc85fbf70/fokazonegozijumifofud.pdf
    • https://uploads.strikinglycdn.com/files/50b1f481-35b6-4427-aeed-d34c786ab72f/what_does_the_a_stand_for_in_the_addie_model_of_training.pdf
    • https://uploads.strikinglycdn.com/files/2ea7c4b4-ce58-48c4-9559-b0990abca19f/zipanolu.pdf
    • https://uploads.strikinglycdn.com/files/b3df8d09-47bc-4d9c-9863-40c8bff071be/11307888876.pdf
    • https://uploads.strikinglycdn.com/files/0c40d116-0877-4b12-b113-a6ddf56664c9/guardian_book_review_the_idiot_brain.pdf
    • https://s3.amazonaws.com/sesafefanulokam/what_is_place_value_of_13.pdf
    • https://s3.amazonaws.com/banula/arya_telugu_movie_songs_free_123musiq.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_off0000f0db.bin
5279d1e564aede4ec88a4de964418dcf2d695dfefa4579815d405cd2d3823353
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 5596 bytes
font_01_sfnt_off000103f7.bin
8cfd95ff876350045f1da661f071d3418d82e4b5e4a22401898f77ff373bf702
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 11200 bytes