Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809433170bfe6dd…

MALICIOUS

PDF

80.8 KB Created: 2021-03-17 13:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b78d6c8817b13d40fc7d856ff8bc8d6 SHA-1: 1b91d480a2339b0b5b5883e38ae3043602b67fc8 SHA-256: c809433170bfe6dd1796d42206c9d65a6741c6a8dd4cd651591b3fea43066b33
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to further malicious documents, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a field guide, likely to trick users into downloading the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://resalured.ru/wix?keyword=audubon+mushroom+field+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4379030/normal_60263506e0d2e.pdf
    • http://itsamorem.com/29574243819ke5fy.pdf
    • http://puduvab.sportsontheweb.net/administration_of_drugs_via_enteral_feeding_tubes.pdf
    • http://tupilofegogevas.22web.org/96270424534.pdf
    • https://cdn.sqhk.co/ripalufix/E8hdWP9/jodiv.pdf
    • http://mekapidi.medianewsonline.com/what_type_of_oil_do_you_use_in_a_briggs_and_stratton_engine.pdf
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ffe425331c25.pdf
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc84c9982df1.pdf
    • https://cdn.sqhk.co/takularozo/hciWB0Y/20255053980.pdf
    • http://sodalabs.pro/52481425217g2j4w.pdf
    • http://tertov.xyz/finesonibexatarenodusasirbbft.pdf
    • http://questotzvezd.space/2011_vw_tiguan_owners_manual_free_downloadh7x3o.pdf
    • http://topdouche.xyz/52600760171mp8iu.pdf
    • http://wijofotezopadik.medianewsonline.com/importance_of_being_earnest_2002_film_location.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1a88d7355bfd471486d7bc90ff72d8b7.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_0db5034749714787ad0a781b61fe1c87.pdf?index=true
    • http://mowumurukilada.rf.gd/lonerwolf_shadow_work_journal.pdf
    • http://xurosuforudev.atwebpages.com/what_type_of_wood_chips_to_use_in_masterbuilt_electric_smoker.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_49ea811f5e8c4b1da49446cf6907f4ee.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_710ddd92552a46c6a040a1e2b73aeb8a.pdf?index=true
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_b23ce04e76a14ec3a7d37f5d2b1619f7.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_off0000fe21.bin
c73588a2fd1681b5d366b93d2b732eca27d9c7b7013cccf2505e8b4685ce83c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 5376 bytes
font_01_sfnt_off0001103d.bin
676a2eff112b30336179d176eac0b4f84faf30b911e9b8f8c2dd48c83a33ec31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 11328 bytes

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