Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c65b3b1166adcf…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 09:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffaca90a3e7e81967a8d211ea1430f3e SHA-1: 76abbcb89dfb10dce94f6015488013c00185870e SHA-256: 57c65b3b1166adcfa1a438c3a3acb5914b070dab448c60b810c9dad13095d4d9
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into believing it is a legitimate search result. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of external URIs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/award?keyword=algebraic+structures+examples+pdf
    • https://cdn.sqhk.co/rasepotobami/iija3rI/dragon_skyrim_locations.pdf
    • https://cdn.sqhk.co/panosiritu/jjhhg7n/singh_is_bling_movie_720p.pdf
    • https://cdn.sqhk.co/rotonoba/abI8xLX/electronic_components_online_site.pdf
    • https://cdn.sqhk.co/tubawonidas/RgcHCig/gilonugiwifutiguxu.pdf
    • https://cdn-cms.f-static.net/uploads/4494433/normal_60647cb99fdb1.pdf
    • https://cdn.sqhk.co/nizufalagef/6xykwjd/funny_ringtones_for_bts.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6047f219c1163.pdf
    • https://cdn.sqhk.co/jojojidatun/Vtgd3P1/16063265357.pdf
    • https://cdn.sqhk.co/livulopo/ifIKGhd/94772906921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85e21184-cead-401f-9d4f-9c9a8835d447/can_you_use_my_cloud_home_without_internet.pdf
    • https://s3.amazonaws.com/votubukaxogilix/jukuvu.pdf
    • https://s3.amazonaws.com/sixolose/69288645310.pdf
    • https://s3.amazonaws.com/zuwosil/como_hacer_estudios_biblicos_dinamicos.pdf
    • https://s3.amazonaws.com/jifesu/19300009689.pdf
    • https://uploads.strikinglycdn.com/files/7acbc8e9-61b7-4b70-8067-6a4fe506a523/sword_art_online_series_order_to_watch.pdf
    • https://s3.amazonaws.com/xowasosuf/video_editing_app_free.pdf
    • https://s3.amazonaws.com/megelugik/anari_movie_video_song_mp4.pdf
    • https://uploads.strikinglycdn.com/files/6d3c85b1-d3a7-4bbc-b264-63a10fe81c71/faruriga.pdf
    • https://s3.amazonaws.com/mekonulegipero/nunupi.pdf
    • https://uploads.strikinglycdn.com/files/fb5fde1a-bd57-48b6-9c6b-11ce18d89b5c/63363581400.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_off0000f44e.bin
88c69bad6d9d9dd025b642e78068b5316d75f2c9d0f81ddfbb4b44d2f66f345e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5672 bytes
font_01_sfnt_off00010788.bin
3cbbbd7747e2678562856b1ed0e946e042dc4bda85c3c958c6c5d8be513d79a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 9920 bytes