Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23de828d9a4352e…

MALICIOUS

PDF

70.3 KB Created: 2021-02-24 15:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ce3375fa2e1b0f914d47568af8ddfb SHA-1: 75e96b177738a4cedb3860cd50af8599666d6725 SHA-256: c23de828d9a4352e48f62ea019f0c4a5a9a857e7e20e4c6f0e2d4480dcf080ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to `http://thecaffeinatedstudent.com/8143299309647d37.pdf`. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

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://bologen.ru/award?keyword=yamaha+p255+stand+and+pedals
    • http://thecaffeinatedstudent.com/8143299309647d37.pdf
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fea0a9b2c476.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_6009cc3d75d55.pdf
    • https://cdn.sqhk.co/rorezina/Ogdihhh/11086968294.pdf
    • https://cdn.sqhk.co/pifixijowoka/hgyjgdK/equalizer_pie_pro_1._1._0_apk.pdf
    • https://vebovaxuzukikom.weebly.com/uploads/1/3/4/3/134352383/reborudu-lolamanatifepez.pdf
    • https://cdn.sqhk.co/losiluja/zeicNhf/72306380142.pdf
    • http://bbbbbbbbeeee.space/69033726133s01si.pdf
    • https://cdn.sqhk.co/xubupigegi/iiKiijd/allied_beast_tribe_quests_ffxiv.pdf
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/gadifuwujifil.pdf
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ff9bd85efb37.pdf
    • https://cdn.sqhk.co/nigudovowa/gcjg2du/hockey_gear_stores_near_me.pdf
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/7438210.pdf
    • https://cdn.sqhk.co/ragejeli/kibeADE/starcraft_autumn_ridge_180bhs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupovobejanam/how_much_force_is_1_nm.pdf
    • https://s3.amazonaws.com/mamukawaxatali/xatirat.pdf
    • https://s3.amazonaws.com/zuxime/medicinal_chemistry_pharmacy_notes.pdf
    • https://s3.amazonaws.com/sowewazulejewi/windows_media_player_for_pc.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_off0000d5d2.bin
0b19ed0bb3acb887ee511f6ef36d494df77d3d3c7b0ca711dbcc11f782f7828f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 5320 bytes
font_01_sfnt_off0000e7d1.bin
64eb0f413c04944a9bed6588470a82a48abc4b602a2d4796eb1fc02cc15bd9f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10268 bytes