Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7688a54563058c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 19:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2acec98021ee15b22b91e3f0dd7bad SHA-1: dd8134399a38efcddc5c7f5842155ef5397e268d SHA-256: 1d7688a54563058c088a98dd92981869860ade7849f248b3ab0bc729a0115dc7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" indicating a large number of outbound links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary malicious URL is https://dafemum.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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://dafemum.ru/strik?utm_term=decision+tree+sensitivity+analysis+excel
    • https://cdn.sqhk.co/zawileveruz/gfif3ja/41447752547.pdf
    • https://cdn.sqhk.co/nukusigemug/tidTidP/stickman_fighter_mega_brawl_stick_fight_game.pdf
    • http://manapuzasupin.sportsontheweb.net/18759627165.pdf
    • http://meroxisawifagu.mygamesonline.org/significance_of_marbury_v_madison.pdf
    • http://kadanijojabuf.mywebcommunity.org/xorofewakifuboposazulaf.pdf
    • https://cdn.sqhk.co/nesadatifu/2hcVgeB/turret_fusion_idle_clicker_mod.pdf
    • http://rujawobezixevib.iblogger.org/55997017510.pdf
    • https://cdn.sqhk.co/semiwewedazi/1Ksncgh/super_mario_world_2_unblocked.pdf
    • http://taxevidel.medianewsonline.com/roles_and_responsibilities_of_human_resource_management.pdf
    • http://xubaseki.iblogger.org/vijayawada_durgamma_telugu_songs_free.pdf
    • https://cdn.sqhk.co/lukulobu/vjaXrge/nisezepikewikitopiwujo.pdf
    • https://cdn.sqhk.co/gabisolovima/fChbjii/jungle_adventure_3_hack_mod_apk.pdf
    • http://sevagawos.getenjoyment.net/tilanevaxebalogefugexe.pdf
    • https://cdn.sqhk.co/fuxiwimemo/ZjeieFI/used_cars_movie_quotes.pdf
    • https://cdn.sqhk.co/dajusonas/Whcnibp/dbz_android_13_fanfiction.pdf
    • https://cdn.sqhk.co/besogevipadi/hjvG6ns/301_blazing_star_trail_landrum_sc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_fc0f214331964424b632fc3fd99e82ff.pdf?index=true
    • http://gataton.rf.gd/certificaciones_online_gratis_informatica.pdf
    • http://jijutinu.epizy.com/zapapenegixezatevoru.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_37148bbc5e1f48a1886c25048fa91fb7.pdf?index=true
    • https://2b08ee71-c141-4a22-85ba-dc1f1cc141ce.filesusr.com/ugd/7ab50f_5a381faf13424844b21e9727209aa8e1.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_d058db418b4f4eb68f0d698fd44e2c12.pdf?index=true
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_2e0231a9109d4556a02c1b1613c04395.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_ad40cb3b88b24064a76916d56458e150.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_off0000e688.bin
eb21c41a757be29f2dc87db2a8aca216eadc563f4a23411939a38ec9919feb14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 5024 bytes
font_01_sfnt_off0000f7c3.bin
da3454f8124fc161de601e2b91b8525c44a708aaac7c238f1f8eee33447b7c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11112 bytes

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