Malicious PDF — malware analysis report

Static analysis result for SHA-256 759954b51e345d35…

MALICIOUS

PDF

74.5 KB Created: 2021-04-10 04:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332e2c67d4888f1e9794ded5d8a3935a SHA-1: 87d1a3f979f4fd6d9500efc669b0c023be8e202c SHA-256: 759954b51e345d35b50014b45cc055fda1460ece55ed71a6f8c8612ba59ef162
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to deceive users. The primary malicious URL identified is lozipotod.ru, which is likely used to distribute further malware or phishing content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://lozipotod.ru/strik?utm_term=mec%25C3%25A1nica+vectorial+para+ingenieros+din%25C3%25A1mica+11+edici%25C3%25B3n+pdf+solucionario
    • https://fasiwuwazaxeba.weebly.com/uploads/1/3/1/4/131438460/4f743.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60208d833b8b7.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_6036647fb0ba4.pdf
    • http://pudepatinogofo.iblogger.org/kusapigagogegajumogu.pdf
    • https://sobidomigo.weebly.com/uploads/1/3/5/9/135960899/da412d5.pdf
    • http://zozegakipuvi.iblogger.org/hey_soul_sister_piano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dusined/43290704076.pdf
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_f30fe8e40e7149508b6598089756f748.pdf?index=true
    • https://s3.amazonaws.com/tinivukedeta/25540743729.pdf
    • http://bisiziwaros.epizy.com/how_to_install_app_store_on_apple_tv_3rd_generation.pdf
    • https://s3.amazonaws.com/sefepugolupalax/92456188506.pdf
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_e33577ff266b477b934172961fec6763.pdf?index=true
    • http://zinimivozu.rf.gd/anchoring_script_for_teacher_s_day_function_in_english.pdf
    • http://turegipamikum.epizy.com/55674539752.pdf
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_630bfcdef74948fb9cc098e0357c9c81.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/45851290388.pdf
    • http://jamoxesadesoxa.rf.gd/bawuvuzejuxesu.pdf
    • https://s3.amazonaws.com/zesixefe/ibm_cognos_controller_user_guide.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ef180a813b0c4070b11bc89345dd36d3.pdf?index=true
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_d132e62cccdc45c88487bf5cdfc26555.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d343.bin
e5f8b5b02e914adebfe169aeb4b1be7ba353177b76770c465ed33e18c4a4069a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 5844 bytes
font_01_sfnt_off0000e642.bin
3da44b3dd5a7f6c5a3cd9ad8d0d51f1972239ea4a960266e2c755d77814f70c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 11220 bytes
font_02_sfnt_off00010b2f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 4324 bytes

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