Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ff1c990eab42e…

MALICIOUS

PDF

179.3 KB Created: 2021-03-19 03:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f0b6413df0636ae1c55ae1783856f0d SHA-1: 7f586e579d36405da79995d06679340ae6018b68 SHA-256: f11ff1c990eab42ee7817b46369d1ab9fc8794df0663d2e2318482e1588207c6
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://nipisod.ru/wix?keyword=oot+randomizer+guide', which is likely the malicious destination. The document body is heavily obfuscated, but the presence of the malicious URI and the strong heuristic detections indicate a phishing or malware distribution attempt.

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://nipisod.ru/wix?keyword=oot+randomizer+guide
    • https://cdn-cms.f-static.net/uploads/4412413/normal_602f2eee7248e.pdf
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602b4cd54df79.pdf
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5ff1c706bec0b.pdf
    • https://tigixunejalimiw.weebly.com/uploads/1/3/5/3/135315438/rilaw_vakadavosinu.pdf
    • https://cdn-cms.f-static.net/uploads/4412160/normal_6017d62d0ffbb.pdf
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/patenapawufusi.pdf
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/4d7583c8943.pdf
    • https://cdn-cms.f-static.net/uploads/4447437/normal_605117cade4b0.pdf
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5fcef564d908d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gomakobez/garmin_gps_78sc_accessories.pdf
    • http://pitefabe.epizy.com/aguantando_junot_diaz.pdf
    • https://s3.amazonaws.com/wujapu/95618852419.pdf
    • https://s3.amazonaws.com/dikomavomem/what_to_read_after_handmaids_tale.pdf
    • https://s3.amazonaws.com/zunewidimem/acer_aspire_e5-_511_wifi_driver_free.pdf
    • https://s3.amazonaws.com/kifutizijebuj/telugu_movies_website_list.pdf
    • https://s3.amazonaws.com/mizeteb/gajoved.pdf
    • https://s3.amazonaws.com/zatazewoz/7987202247.pdf
    • http://sulumasofip.epizy.com/dutarefofagamut.pdf
    • https://s3.amazonaws.com/wiwamoxamo/alerus_fsa_claim_form.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_off000287c5.bin
5ef5a60a5744f76189b27122499ab882b982269038e259702fe1adfb7da1d53f
pdf-font-stream PDF embedded font (sfnt) at offset 0x287C5 5012 bytes
font_01_sfnt_off000298be.bin
3160c22ec9f37f153c224a97bd58565cf1fab37998cd742237583819f203c472
pdf-font-stream PDF embedded font (sfnt) at offset 0x298BE 11316 bytes