Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4a1be56992e1c1…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 03:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61d3f35439e46f230cdd51d67f83e6c SHA-1: 51c3df245e0cb0e29500736e8886adf58f720835 SHA-256: ab4a1be56992e1c1fd93613c338685ead19d724b6794104d61dc64de47b8c98c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, appears to reference educational content, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=exponent+rules+worksheet+answers+mathworksheets4kids
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/siwimosuguwe_pobiga_fuzuvolavaduse_dodadejomewob.pdf
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/galajuxe_tavimusiwixale.pdf
    • https://cdn-cms.f-static.net/uploads/4421623/normal_600be4f4c1d8e.pdf
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/8936105.pdf
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/9655a870e3df.pdf
    • http://wuroguredogir.getenjoyment.net/ayat_kursi_arabic.pdf
    • http://zuwodaxa.iblogger.org/42831579823.pdf
    • http://zereteleriw.getenjoyment.net/define_variables_in_research.pdf
    • https://cdn-cms.f-static.net/uploads/4407576/normal_60355066f14ae.pdf
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/1686137.pdf
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/deredoguzak-gekugogu.pdf
    • https://vemujevamari.weebly.com/uploads/1/3/1/4/131452814/8757875.pdf
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fff73f34468e.pdf
    • http://pegijegur.mygamesonline.org/catalogo_cedulas_brasileiras_gratis.pdf
    • http://vopukisavenif.medianewsonline.com/sociology_optional_notes_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vimiromomekex.epizy.com/battle_angel_alita_volume_3_cbz.pdf
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_df7d67fafba1455288cff20386f967ec.pdf?index=true
    • http://rixibedi.onlinewebshop.net/dell_precision_m4600_ram_upgrade.pdf
    • http://kobewanen.rf.gd/jusimonukibimamiwoniva.pdf
    • http://verulufana.rf.gd/dicionrio_hebraico_portugus_aramaico_portugus.pdf
    • http://vuxikujare.epizy.com/essay_structure_template_harvard.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_4a4a8f048c794f83b0fe2efc593dabbd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e728.bin
ecf9f31bbafb8078818d090d24e300c3479a7af65ca7907c019670e65a6f5aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 5468 bytes
font_01_sfnt_off0000f9b1.bin
18317174428051335ddcad19c14f8db47f0c33883c961f9566b10621e92dd883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 10916 bytes

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