Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4e77aea13b19f6…

MALICIOUS

PDF

84.5 KB Created: 2021-03-28 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30cc4f1ec4f6f8fc07ea70b4b6d891f1 SHA-1: e97c1d38d678fc2d70c309be2b9ec172a8e4e451 SHA-256: ca4e77aea13b19f647ab866d474f2510f062b61092b9b4e16407cd38ad1e75c8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it functions as a link farm for SEO purposes or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=soccer+heads+2+player+games
    • https://cdn-cms.f-static.net/uploads/4366375/normal_604ee59f7e15f.pdf
    • https://cdn.sqhk.co/tezofugowura/oMicIrG/flying_simulator_3d_mod_apk.pdf
    • https://cdn.sqhk.co/rizijuwet/agiiyld/bein_sports_live_football.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_6049d42e9ae5a.pdf
    • https://cdn-cms.f-static.net/uploads/4451563/normal_604d34f455184.pdf
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fcd096e68fe2.pdf
    • https://cdn-cms.f-static.net/uploads/4465690/normal_5fe6bd6671194.pdf
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cb6c72f52.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6054d7b7da28d.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_60462ef18cae2.pdf
    • http://puzivulagu.iblogger.org/tofopuzisebamapipotumemuf.pdf
    • https://cdn.sqhk.co/kazaluxi/Wicjfge/karenusijosepojixomogiduk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kogogugo.rf.gd/stay_with_me_ost_goblin_matikiri.pdf
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_f863b7e061914dbf81c8c86db29fcaf9.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_c262efcd8e674ffb9011c3925da0bad3.pdf?index=true
    • http://rekewam.rf.gd/multiplication_crossword_puzzle_grade_5.pdf
    • https://uploads.strikinglycdn.com/files/840520fe-06b3-4903-9e10-186845c468c6/budizuni.pdf
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_274c798cde2b4b2393a73e169a35f6d8.pdf?index=true
    • http://dizutobasuxolom.epizy.com/latex_template_cornell_notes.pdf
    • https://uploads.strikinglycdn.com/files/20242316-cef1-4ace-8588-8587d0b0c744/how_to_disassemble_little_tikes_race_car_bed.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_off00010b9c.bin
58d519701a778c7891c81d2c93dc810470134193161cd467fcb08cd52a0ad129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 5824 bytes
font_01_sfnt_off00011f53.bin
f3402ab43c369eddb84d97a4feaf6ea7f7488784df50c15acdbec387232a454d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 11016 bytes

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