Malicious PDF — malware analysis report

Static analysis result for SHA-256 141ead614c74421a…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 22:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e1ee648383316230d24b58c2d2be20 SHA-1: 76c866c4144234f42aff8ae13d656d603ecbdd01 SHA-256: 141ead614c74421ad43c825ccb911d40fc06d033e75bc40168f64c23e8698269
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'zajinet.ru', suggesting a link farm or phishing attempt. The presence of embedded PDF link farm heuristics further supports the malicious nature, likely designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=bitencourt+penal+volume+4+pdf
    • http://raraveluwogevuw.mypressonline.com/cloth_bag_making_business_plan.pdf
    • https://cdn.sqhk.co/noperizapewo/riejhhe/gonazofofo.pdf
    • http://tonilakifak.mypressonline.com/zadujevafuximawikonuj.pdf
    • https://cdn.sqhk.co/bevoroxur/LhcOnl0/kgf_movie_songs_ringtones_download_telugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/foneniz/acute_bronchitis_guidelines_2017.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_1889431d9c9d41e3b52a4521033b00d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/566959f0-81e3-4244-9b32-0b98148e8157/authentic_happiness_via_survey.pdf
    • https://s3.amazonaws.com/legapatatezisa/breakfast_buffet_menu_five_star_hotel.pdf
    • https://uploads.strikinglycdn.com/files/88214cb5-34c3-433d-9968-20075dbdd492/who_is_jlab_audio.pdf
    • https://uploads.strikinglycdn.com/files/a38b6e85-8e34-429c-ad6f-22d15ff50a3b/73202142091.pdf
    • https://uploads.strikinglycdn.com/files/cdca1ca8-7399-48d8-945c-67a8495c20a9/how_to_re_edit_text_in_paint_3d.pdf
    • https://uploads.strikinglycdn.com/files/69c27b82-095b-453c-8be6-17f02ed3bfed/takavugusukiwojukubulikij.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_84ff7647f84a44d486e5305db10ce633.pdf?index=true
    • https://s3.amazonaws.com/jokotaziweluge/are_siemens_hearing_aids_any_good.pdf
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_cb83481e90a94fc2a8d01e1dffc164d6.pdf?index=true
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_b529d92513ac45da93a1dbac12bc3f46.pdf?index=true
    • http://gujimosodaza.myartsonline.com/9419791485.pdf
    • https://uploads.strikinglycdn.com/files/936baf4c-2a18-43f1-9655-00c02138a0f0/wovuwuzax.pdf
    • https://uploads.strikinglycdn.com/files/6fb01555-978e-429e-a91b-ce710fa19361/degiwuzidadogarenewaku.pdf
    • https://s3.amazonaws.com/remavuj/73710935633.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_4fea6f83b8f2489dae7293e629de0df9.pdf?index=true
    • https://s3.amazonaws.com/remufuzu/asos_size_guide_aus.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_off0000df09.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 6440 bytes
font_01_sfnt_off0000eefd.bin
88cf17403faf6bb13e0b02b999917d7e31beee14339a1f54abe64b96d3ec1fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5320 bytes
font_02_sfnt_off00010114.bin
1e9172374ebb9684543bb34aeca426ee9d49bb02ac6af6e902170fa1624c88e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 13624 bytes

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