Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ecfab6ac15523c…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 16:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c08454322db62c922f62954217bbe53 SHA-1: dc58cf3fce375cb651db1cd9ad62356243677655 SHA-256: 10ecfab6ac15523cde52cb5ead675f95152136e278549339957e099efe2b56aa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to drive traffic to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=norton+reader+pdf
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/gixiva.pdf
    • http://oneitstore.info/41383375269d4bik.pdf
    • https://cdn.sqhk.co/moviferu/UhwEMmO/37030060272.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/9814760.pdf
    • https://cdn.sqhk.co/baruduwege/ijfgcaV/top_10_kingdoms_in_the_world_2018.pdf
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/zafujofuj.pdf
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/8587673.pdf
    • http://kozlo.space/waterlooworks_interview_relief_formhd6cd.pdf
    • https://cdn.sqhk.co/noviraxat/hhhfmij/evolutionary_approach_psychology_examples.pdf
    • https://cdn.sqhk.co/tomubozes/beFihha/cooking_master_boy_watch_online_free.pdf
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/8450355.pdf
    • http://devgm.design/new_audio_naats_2018y7l5s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefepugolupalax/chapter_7_ionic_compounds_and_metals.pdf
    • https://s3.amazonaws.com/kubedukowug/taunton_weather_report_12_june.pdf
    • https://s3.amazonaws.com/sabegokek/46045328298.pdf
    • http://pesuvomekujidi.rf.gd/ccleaner_android_baixaki.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_off0000e0b1.bin
c5393c87d0e02b7bc09719d7f75e4127f735cbc1a1ccb01f93f4af7a85ede9d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 4792 bytes
font_01_sfnt_off0000f115.bin
3cdc5a502ed7ba335d6d98cf4cce836f45a975f3ef036edd74b36d04cd0d96f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10356 bytes