Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae91a48d1e9a5b…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 17:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a41097fbb721d27e6abe5aad72a4fbc4 SHA-1: 57a353ac38ed06d1a98bc9a9c144079911cc14d5 SHA-256: 4fae91a48d1e9a5b8f2814c06b7c9ec8cc85d41e1ba77536335386deccf5813c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. It contains an embedded URL pointing to a resource that is likely part of the attack chain. The document body, though truncated and obfuscated, suggests a lure related to educational worksheets to entice users to interact with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://resalured.ru/123?utm_term=slope+intercept+form+word+problems+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6043fee6b7148.pdf
    • http://copyrightproblem.com/92385899237hbzfx.pdf
    • https://cdn.sqhk.co/zanudiwageg/dgcughB/dixad.pdf
    • http://tanemazijafawin.medianewsonline.com/puguselezomuwobatun.pdf
    • http://nalowisep.22web.org/audit_report_contents_and_types.pdf
    • https://cdn.sqhk.co/kogoruzojif/yjhhgKN/most_annoying_sound_ever_10_hours.pdf
    • http://sadovik.me/75764547121lzwmv.pdf
    • https://cdn.sqhk.co/soziwariru/ghheHuW/rojapigu.pdf
    • https://cdn-cms.f-static.net/uploads/4464330/normal_60432b5e642fb.pdf
    • http://dogalijun.scienceontheweb.net/best_arm_workout.pdf
    • http://wotidoteked.mywebcommunity.org/how_to_lose_weight_quickly_on_paleo.pdf
    • http://scriptbook.xyz/gojiwevag4wdbe.pdf
    • https://cdn.sqhk.co/daposofoxig/adhfjNG/doom_films_in_order.pdf
    • https://cdn.sqhk.co/rogekanus/goyjjiU/england_games_euro_2020_on_tv.pdf
    • http://m-ryanaf.site/libros_de_psicologia_cristianaqv37d.pdf
    • https://cdn.sqhk.co/veletafi/ji5jgb5/play_hearts_for_free_download.pdf
    • http://mon-compte-cmb.best/2007_chevrolet_impala_ss_sedan_4dml1ww.pdf
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6019c42abd220.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vekejuf.atwebpages.com/currency_trading_for_dummies_3rd.pdf
    • http://buxamojajowolos.rf.gd/senior_leadership_team_meeting_agenda_template.pdf
    • http://rutozaduv.epizy.com/zezatupipu.pdf
    • http://zalowakudedakov.rf.gd/50110866629.pdf
    • http://fogusevo.epizy.com/fupagezizebepuvipebekaxol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe95.bin
9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 2900 bytes
font_01_sfnt_off000108da.bin
1b89db26bf783897eb07a3878b9cc56abf337cf7682992ea3a4f65868d634376
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 5584 bytes
font_02_sfnt_off00011bbf.bin
205fec8865ad19e08ae48b465c7c767dd8db767567acab1fde761ae914bd6171
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 11464 bytes