Malicious PDF — malware analysis report

Static analysis result for SHA-256 6417b850e6178264…

MALICIOUS

PDF

76.2 KB Created: 2021-04-06 14:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcaf578c1bdff693cadfc330c73f09e5 SHA-1: dd2a29d8f3b0176f1a2862df76ce4338ff4123a0 SHA-256: 6417b850e6178264fb9d8645b115d90a0cbecae368af4368c424d374199460e3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=chair+gym+twister+seat', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=chair+gym+twister+seat
    • http://pegijegur.mygamesonline.org/achyutashtakam_sanskrit.pdf
    • https://cdn-cms.f-static.net/uploads/4411250/normal_602fdbb9527fe.pdf
    • http://monubagujizud.mywebcommunity.org/what_body_type_is_a_skinny_fat_person.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_6052cc42e5d5d.pdf
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cb6c72f52.pdf
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/podudoxapajib.pdf
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/3031593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ginutu/book_report_format_5th_grade.pdf
    • https://s3.amazonaws.com/tuzamada/update_listview_android_adapter.pdf
    • https://s3.amazonaws.com/feseni/speed_queen_error_code_er_co.pdf
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_75ed36ce10e842699f395d2b4c74963c.pdf?index=true
    • https://s3.amazonaws.com/pomaxa/47971677573.pdf
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_c3b2a9420880407583f9a2e07c2cdea1.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/android_get_wifi_password.pdf
    • https://s3.amazonaws.com/pisedij/basic_resignation_letter_template_nz.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_26546e90c6494ab5a45a626d9643f67e.pdf?index=true
    • https://s3.amazonaws.com/jexijer/food_franchise_business_plan_template.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_off0000ebc1.bin
d101b8047312f13251acc6b53e6e8401b763fb6f7207a804effc37c42422f86b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5164 bytes
font_01_sfnt_off0000fd3b.bin
af40cc41eee9af41fadd1b8653192f1ba6b1fafdbcdc40971e7e9a5d7bb6facc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 11428 bytes