Malicious PDF — malware analysis report

Static analysis result for SHA-256 75769aca8a6208f2…

MALICIOUS

PDF

84.9 KB Created: 2021-03-22 20:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fc4a3bc0405eed52650e43f751342b5 SHA-1: 7b6ef6d1193a19322ce0ef5f7f726d779a3f2050 SHA-256: 75769aca8a6208f29fde1bc41d08622b71b04e7d300c4a77342508f9a9bacb3b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and numerous URLs point to a common tactic of using documents to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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://botokaw.ru/aws?utm_term=why+are+ipads+important+in+the+classroom
    • http://nibajafij.medianewsonline.com/what_does_horus_symbolize.pdf
    • https://cdn.sqhk.co/ketalidukepi/jqhhNhc/cara_top_up_play_store_di_indomaret.pdf
    • https://cdn.sqhk.co/tatidukigag/QmjcP8g/vuluxejasore.pdf
    • https://cdn.sqhk.co/xazururoxe/Qwjgjha/vazezezaded.pdf
    • https://cdn.sqhk.co/loganidob/aZcGja9/vijay_tv_office_serial_ringtone_mp3_free_download.pdf
    • https://cdn.sqhk.co/wifinalimow/YijAgeS/nupipu.pdf
    • https://cdn.sqhk.co/bowazeduz/mgiTwDr/90s_top_english_songs_mp3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kenesowozowojaw.myartsonline.com/xikejebefadaboligugu.pdf
    • http://zorikeroz.onlinewebshop.net/canon_mp240_error_code_e5.pdf
    • http://bebovufuvuji.myartsonline.com/mind_reader_book_bangla.pdf
    • https://uploads.strikinglycdn.com/files/a42f7a5b-f4ec-41e1-a2f8-62dc51d24dd3/donate_baby_clothes_near_me.pdf
    • https://uploads.strikinglycdn.com/files/d8c234a0-e51c-46c7-a0cc-dd7702837659/22609280350.pdf
    • https://uploads.strikinglycdn.com/files/60cb5665-67b2-41df-bc54-e4b1d492ee0a/what_type_of_poem_is_we_are_seven.pdf
    • https://uploads.strikinglycdn.com/files/9533afc0-3517-45a3-b191-963a186fcdb3/ranisovanabet.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_87d85e694a84427bb12cc8e5edaed68b.pdf?index=true
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_e2769d07541a4555b6aa099cd80de692.pdf?index=true
    • https://uploads.strikinglycdn.com/files/013954eb-6684-41c4-93d2-29e52835aee9/70029185129.pdf
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_5c1fd1ef7c2d4ecebaf5692983c9f485.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c69ab4a8-e8d1-48a8-92c6-f3b009450837/how_to_write_dual_dialogue_in_final_draft.pdf
    • https://uploads.strikinglycdn.com/files/ee20657d-b93f-4953-a72b-13da200562a2/dajotabudiximukarukuk.pdf
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_b7c17045682c4e77b0d078779462bc1a.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d1.bin
3117c2606a18bad89f4a3fb365d014eb91de1b209fc43cb519b213d4cea7724f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5216 bytes
font_01_sfnt_off0000fa70.bin
def40edd718b96de1950f54a198aa6d9fea03f62c241b03dfd72b33ffcb46f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 11016 bytes
font_02_sfnt_off00012040.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16312 bytes
font_03_sfnt_off000135cc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 4324 bytes

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