Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b44ea84e4a7cb4e…

MALICIOUS

PDF

74.4 KB Created: 2021-03-09 04:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e1a6cd1591e76af8501c15846317a94 SHA-1: 7a7b5164e23eb9020c96fc12be1da3a818448082 SHA-256: 3b44ea84e4a7cb4e2eaa238ed45097e173bb1bf9cf34d4593e9972de7d274637
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm with numerous external URIs. The presence of embedded URLs and the PDF structure suggest it is intended to lure users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/wix?keyword=natasha+culzac+cursed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff600832e2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_6041e20bbcf82.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/ntcW3he/dr_kong_dentist.pdfIn PDF document text
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/pabisodo-buwoja-rufaso-zepizilirilejuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fd123620afe1.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/d92004f3d860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_6024192fb526c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_5fe93ee3ab506.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/gdjd9uj/21450908381.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/933936.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/hfgdife/samsung_voice_recorder_settings_play_continuously.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/hih9ggD/child_care_aware_sign_in.pdfIn PDF document text
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/lugutur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabcd9b7-dda0-4cd8-abd8-09d0efc26535/16798282785.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_f65c0a58b95a49cb99c8a46993b0cb40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/canon_mf3010_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c26eefb-47e7-437b-9494-85f2b8419cba/which_chart_to_use_for_time_based_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeb85c9-826b-4505-9057-92acffcdbcec/dixuvumuruwexufo.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_28e467d65313405cb3ef56fbdd549d93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/bounty_hunter_tracker_iv_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/77862052142.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_ed484ced81b74a179854700d27c50b4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinilederu/guvuniraxewenosular.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/zonukirujiwixulida.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5048 bytes
SHA-256: af8631e10ac7527e61e3a86ac2862844ae17dd9771ff07f7e44c6d3ef94071e3
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 11032 bytes
SHA-256: eac47fc2c4e23cba2b4000abedbf5b20b8e839118188e199751104cb887fc9e9