Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20c4093a07d5096…

MALICIOUS

PDF

71.5 KB Created: 2021-03-18 23:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fdf5b05b325f5b5681c34c09410be5b SHA-1: 9f7ed9f08bcfea8bef568f6834ad1f0cebfa17c6 SHA-256: c20c4093a07d509637d7515faed4a05f227c8e3b121b76fa6c832c110bc2ccb2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/wix?keyword=halo+2+theme+midi
    • http://criticcxck.space/20292265938ow136.pdf
    • http://testrun.ru/american_megatrends_bios_5.13_manualm6rgz.pdf
    • http://tomogorman.com/naxaluponuwoterohv0zy.pdf
    • http://creditscoreusa.info/dodiraugdn.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_602665efd5a3c.pdf
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5ff2aa771a387.pdf
    • http://com-copyrighit.com/brother_song_status_videog8954.pdf
    • http://tevutubiwij.getenjoyment.net/mouse_guard_roleplaying_game_box_set.pdf
    • http://salestore.pro/westinghouse_timer_instructions_284832o10u.pdf
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fe18873d88a8.pdf
    • https://cdn-cms.f-static.net/uploads/4450640/normal_6038fd238f53d.pdf
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5fdf26bd49cbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d425e386-8ace-4586-a771-7bb565497f09/rita_hayworth_and_shawshank_redemption_summary.pdf
    • https://s3.amazonaws.com/bisiku/73869993358.pdf
    • https://uploads.strikinglycdn.com/files/b434cdca-a1fc-4e46-b7d0-92992bbba7aa/why_is_there_no_substitution_effect_for_perfect_complements.pdf
    • https://uploads.strikinglycdn.com/files/67b79c96-1f6a-4820-9327-7a3ce3325888/53365542750.pdf
    • https://uploads.strikinglycdn.com/files/6dc8baf6-dd1c-474a-a74d-e0d6db49d352/how_to_use_a_motorola_talkabout_walkie_talkie.pdf
    • https://s3.amazonaws.com/jinotugiwomo/adding_and_subtracting_integers_worksheet_pizzazz.pdf
    • https://uploads.strikinglycdn.com/files/ab505b8e-b5ae-4d15-a8c2-492669043f2b/octavias_brood_summary.pdf
    • http://namepafubi.atwebpages.com/dish_tv_plan_2020_list.pdf
    • https://s3.amazonaws.com/lizuseguwix/wawurokuwunavifefapomuza.pdf
    • https://s3.amazonaws.com/xakusineba/cholamandalam_claim_form_part_b.pdf
    • https://s3.amazonaws.com/tesotiwapax/guided_imagery_for_pain_management_scholarly_articles.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb60.bin
4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 6588 bytes
font_01_sfnt_off0000dbd9.bin
e74fe1607213dca2272ea4271b882822d66b09df3dce0b694dc19408d6265c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 4884 bytes
font_02_sfnt_off0000ec4a.bin
93b27c2dfd3b20200782bae143100df7df0da3c5d1344c2e819831618cd0ce67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10152 bytes

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