Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b96414e05c51828…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 18:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e475df2967561da11456fcfa7e183afc SHA-1: 2fde83e2f743d1b8115bdc38d988ddcac63b4cbb SHA-256: 5b96414e05c5182813efd22a27b894591e12041e5979ec553156a8a87af90934
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=how+to+harvest+butter+lettuce+leaves
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/8067353.pdf
    • http://nigavereke.mygamesonline.org/tyler_model_of_curriculum_development.pdf
    • https://nemulokisen.weebly.com/uploads/1/3/4/4/134492012/9826612.pdf
    • http://dalifajebuxog.scienceontheweb.net/93845711285.pdf
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/3408539.pdf
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/jubejekinitafufovan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezetega/46612469122.pdf
    • http://jozilaro.atwebpages.com/xalonalelup.pdf
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_4ac156247f7c4c0c86e0f18ca7509276.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_13f918959fc94556b56852c0e9fa5e1e.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_0b6107fd581944738b01a44e6cd94f14.pdf?index=true
    • https://s3.amazonaws.com/wefemabeni/feledizudu.pdf
    • http://rokimaligevijep.rf.gd/viewer_toolbar_change_title_jquery.pdf
    • https://s3.amazonaws.com/juwofuxufijup/font_aksara_sunda_microsoft_word_2010.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_8aca5d771ef347af9b5aaf27610b4f7b.pdf?index=true
    • https://s3.amazonaws.com/dusined/behavior_comments_for_report_cards.pdf
    • http://bazimiguzanuv.rf.gd/89720818934.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_off0000e3d9.bin
e9c9b5f6349c81e07e24f385f0ef2c31977fa13a03635ceda0ccdd9f85553ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 5140 bytes
font_01_sfnt_off0000f565.bin
a8ce8d184589a6e31adcc6aa13656403c7486c7bc16f0e10a7272bedca020426
pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 11164 bytes