Malicious PDF — malware analysis report

Static analysis result for SHA-256 804b7b84c7e017ca…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 14:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c085a2ef5d8ec62b2bc3866a1f11f3d7 SHA-1: 509271c3f0b9d965186adb29b9f271000f8bcefe SHA-256: 804b7b84c7e017cab243ae0f8955995d6552206b5823c25086d613d965f378c2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be related to educational content, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jumiwimov.ru/wix?keyword=continuity+and+differentiability+class+12+worksheets
    • http://sellforce.ru/gym_shower_without_flip_flopssuyr1.pdf
    • http://dotavulilego.mypressonline.com/the_warren_buffett_way_review.pdf
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fcb8d78a1a78.pdf
    • http://biomanix.best/encuentros_maravillosos_answers84t6p.pdf
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fe6f52487940.pdf
    • https://cdn-cms.f-static.net/uploads/4454984/normal_601797e0b0e2c.pdf
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5ff9ca2aae96c.pdf
    • http://teplotronic.ru/rirukaxilizarep4kmrs.pdf
    • http://btsworld.org/glitch_text_premiere_pro_presets_freeemx7j.pdf
    • http://nejevefivi.mypressonline.com/66798145363.pdf
    • http://amst-watch-v2.club/bamuvibafusosogipijoffl2yy.pdf
    • http://zumepaposakuf.scienceontheweb.net/how_do_i_setup_my_hp_laserjet_p1102w_wireless_printer.pdf
    • http://famozosivupiwij.sportsontheweb.net/beats_solo_2_wireless_change_battery.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xisefowu/joomla_templates_free.pdf
    • http://sijadogif.atwebpages.com/remington_pg6025_parts.pdf
    • https://s3.amazonaws.com/suxuzubojut/61863310860.pdf
    • http://jawuwibunoropo.atwebpages.com/biblia_catolica_para_jovenes_gratis.pdf
    • http://pimoxonevuwewax.atwebpages.com/94863401042.pdf
    • https://s3.amazonaws.com/gapuruxumeg/d_d_5e_druid_spells.pdf
    • https://s3.amazonaws.com/geradi/28328406463.pdf
    • https://s3.amazonaws.com/zozofufulolig/gazizakufavex.pdf
    • https://s3.amazonaws.com/pevarijidasalop/custom_cut_wood_table_top.pdf
    • http://felugibesixe.onlinewebshop.net/are_refurbished_beats_good.pdf
    • https://s3.amazonaws.com/viromibukoleliw/kendo_grid_column_template_jquery.pdf
    • https://s3.amazonaws.com/xapota/33593063769.pdf
    • http://sidepojedava.myartsonline.com/lapogidumukifilu.pdf
    • https://s3.amazonaws.com/fukezavazuj/98090290483.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_off0000efce.bin
59859f369913715bd5c43eaa663962dfc04ce8ff7f1a743598f57a1831db8bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5596 bytes
font_01_sfnt_off000102ef.bin
cf9639a99cebab8853d7fb34116e6c059fadb9c1cfbf0ea0d99fa7fa1ec3a0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 11756 bytes

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