Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb76ad02f8e9c370…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 08:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5074be8bcb869f8d5a1d2e8d8308301 SHA-1: b184bc644e3cebc0f8879ac01a03c80a972d49b6 SHA-256: bb76ad02f8e9c3702c0a0c05ddade038e9aa0d4f5d7360349e4abf2cc57d71a5
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content. The presence of a 'download' call-to-action phrase further supports a malicious intent to trick users into downloading files. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=bodyboss+12+week+fitness+guide+pdf+free+download
    • https://cdn.sqhk.co/xodegajeriw/jeididf/57886882631.pdf
    • https://cdn.sqhk.co/dufubimaru/gjaHEHd/stickers_para_whatsapp_nintendo_switch.pdf
    • https://cdn.sqhk.co/sokodajep/ibMlFFh/67771658254.pdf
    • https://cdn.sqhk.co/fusaduxuw/gl8923V/48271460545.pdf
    • https://cdn.sqhk.co/nudofarus/VruqJjj/vevodezeduj.pdf
    • https://cdn.sqhk.co/feduminaro/iEkkNvA/tavosaxuvetuwibulik.pdf
    • https://cdn.sqhk.co/vemetafije/ejj24gf/38642461494.pdf
    • https://cdn.sqhk.co/garisuvonuk/bMyhhdd/14405757616.pdf
    • https://cdn.sqhk.co/vimexuda/cBwliTI/mining_inc_game_max_level.pdf
    • https://cdn.sqhk.co/retesixabe/ejeSvjj/super_mario_64_ds_cave_dungeon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_2dab17e382224dceb8b8b2e4d14a5fc4.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_4dd7fded33df4cc1b65fd95f32ed25f5.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/definition_of_urban_community_in_sociology.pdf
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_0f4625f902d74444802c45903c9480b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f4b7575-eccc-4604-ac4d-e317b10ad7eb/risozitonipinonadeduki.pdf
    • https://s3.amazonaws.com/nezanurugega/microevolution_vs_macroevolution_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8c23e04a-0737-4e61-82a8-41229792c776/how_many_amps_does_a_compressor_use.pdf
    • https://uploads.strikinglycdn.com/files/e4993d63-7801-4402-9bad-8a127b2301fd/92515950319.pdf
    • https://s3.amazonaws.com/lazolu/sound_of_silence_sheet_music_saxophone.pdf
    • https://uploads.strikinglycdn.com/files/6e0cd20d-fa71-40a9-a13a-e484bdd51b4e/bose_sounddock_series_iii_digital_music_system_black.pdf
    • https://s3.amazonaws.com/firudegix/lipuk.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_off0000eded.bin
cf86c7fa2bb2a3c0ec76932b52f0c3f87031a2f438c237b0b6c8ec3705e1d88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 5840 bytes
font_01_sfnt_off00010203.bin
7d9dc46d7f1d73133c14965738133f6690b0da24f0d09d541946c321c8eb3fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11036 bytes

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