Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db1e158e1397b0…

MALICIOUS

PDF

80.6 KB Created: 2021-03-11 17:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3de0169c9a202f81953df542c39cc647 SHA-1: d02c519c0d07c766fa38b3fa4a91eb434601d44c SHA-256: 70db1e158e1397b0e8802cb01766bc69a454097f77cbcc828ebbc9ba340b12e7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational material. The presence of external URIs and the overall structure indicate an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=answers+of+chapter+11+maths+class+9
    • http://jexujililizatub.22web.org/22999907117.pdf
    • http://tezibif.mygamesonline.org/pezonovi.pdf
    • https://cdn.sqhk.co/kepozote/igeGge6/muwanov.pdf
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fff521b196ea.pdf
    • https://cdn.sqhk.co/novitovikor/jmibNH7/turning_radius_formula_for_ship.pdf
    • https://cdn.sqhk.co/dabozijide/gfgeJid/ringtones_for_iphone_free_songs.pdf
    • http://muluwusive.22web.org/fuxowamupezixotoxizisujol.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/lugew.pdf
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ffbd3f8e7179.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601b3666a31b7.pdf
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/588b0a4907a930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://towudigumiratis.rf.gd/rasoxafunidefeb.pdf
    • http://tujefozumuresul.epizy.com/avolites_tiger_touch_ii.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_b9398b2e5e4d4ff0811697d5e8016dd0.pdf?index=true
    • http://fajazimigig.atwebpages.com/today_is_a_good_day_to_die_gif.pdf
    • http://fotizerenodafik.epizy.com/google_sheets_app_wrap_text.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_5358c58fb5d64131ad972deb824333e8.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_795cb16fe43349d2ababa6f1dec53033.pdf?index=true
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_e44d9b4303a9463db1b7881083a8009d.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75d.bin
6a70cf299fa523f5824bc74c59a8f0c6f0c0a86a5b6807ef7f958abb80a8a695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 5544 bytes
font_01_sfnt_off0000fa2c.bin
6064ed639fd1dcd3baffe1f61299161dd17e17b2d3b5858c3f60ce19bde50b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10912 bytes
font_02_sfnt_off00011f93.bin
93de0632541ff2d633f890bf8f12f72953bac633627d715ed0274eacfd338b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16252 bytes

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