Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4723e834ab0c34…

MALICIOUS

PDF

88.2 KB Created: 2021-04-01 11:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 958f6814fb01f926ce0d406e0ac9b268 SHA-1: dab43956703eeef65d458e706e321aa0d7580028 SHA-256: 9f4723e834ab0c3429d4b27abc311b712901c04499756354c0486dd1397785a6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'ponafet.ru', which is highly suspicious and indicative of a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature. While no scripts were explicitly extracted, the presence of an external URI suggests the document is designed to redirect the user to a malicious site, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ponafet.ru/award?keyword=athlean+x+max+size+free+pdf
    • https://cdn-cms.f-static.net/uploads/4412767/normal_600a4e5d7f57b.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_603e1b4657505.pdf
    • https://cdn.sqhk.co/nalujujoso/0jghh9Z/my_shopping_list_notes_to-_do_list_app.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6013ea39b1e00.pdf
    • https://cdn.sqhk.co/dinigivo/WcMrjdS/download_bubble_shooter_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/sizafutito/ejbbDJF/86765339203.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_601bd3b273beb.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_605cd1f52da12.pdf
    • https://cdn.sqhk.co/pofifarim/2igghgd/fefuxadiwusebit.pdf
    • https://cdn.sqhk.co/dasotipamu/rgd8fji/93169367841.pdf
    • https://static.s123-cdn-static.com/uploads/4411931/normal_6002dd930da85.pdf
    • http://vengriya.space/296604147585nvh7.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_600b73eb88dd7.pdf
    • http://hookup157.online/empower_c1_download2zwp6.pdf
    • https://cdn.sqhk.co/bipozipo/es5kFPU/ffxiv_fate_leveling_guide_2020.pdf
    • https://cdn.sqhk.co/vadetegubufo/tgcYhi8/bloodborne_pathogens_test_answers_true_false.pdf
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fde2a37b3114.pdf
    • https://cdn-cms.f-static.net/uploads/4490132/normal_603107fcb3a42.pdf
    • http://titanovyi-filtr.ru/xuzonuzipofezojutomiligx6i2j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011941.bin
2790efa1772a6ba8ccce062d00d82d19ee74aafa0dd9f9967aa3ec533bf88cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 5388 bytes
font_01_sfnt_off00012b7b.bin
5f6920c2977582f74ef32b72711c02584290465acba19d7ab71f27f8666a68c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 11428 bytes