Malicious PDF — malware analysis report

Static analysis result for SHA-256 1086116aa96cdd6f…

MALICIOUS

PDF

69.9 KB Created: 2021-03-29 06:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 597bd90ad04103d32240f27de339179c SHA-1: 56b599ca83ce3d297d228d7d54debb3e1550cab4 SHA-256: 1086116aa96cdd6f99378f8e4f2e550f3dc025d95ceb42a5068ca66df9a8f2f8
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic and potentially host malicious content. The embedded URL points to a suspicious domain, and ClamAV detection confirms its malicious nature as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content to entice clicks on the external link.

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 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.
  • 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://soxebez.ru/strik?utm_term=bill+of+rights+worksheet+answers+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414867/normal_6043f3795a8b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_6019a22e84a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_605314ef54f2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5fed11dfad84e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/32437055671.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/assassin_s_creed_2_the_truth_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/how_the_holy_spirit_is_god.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_74d2f956a8e84860ad3590f0a1cf12fb.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_970d79d8d0424499a3cb50b0cc1e59f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fd7499-7cd3-4867-a973-79ed57682504/72122156948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286cc687-09f1-4a8a-957c-e6f8dd87757c/how_to_turn_on_vizio_32_inch_tv_without_remote.pdfIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_fa4c9adafa6e47119b8ef42cd3e7525d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/cg_video_dj_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/73910905546.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/define_contemplated_action.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee6c8c0-a849-40fd-af65-9fc80c3ce075/jiwijalibefaluxuwuvonip.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/compass_math_test_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/romeo_and_juliet_act_1_scene_3.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_9f8c055e1e60457fbe0d3011231b6647.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/012b36d9-cb7a-4564-beef-d208dc5e5b7a/gebavibajuna.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/el_juego_del_ngel_completo_gratis.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_6401b0a8910c42aa8518d54022a661d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/technics_rs-_bx828_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/cestino_android_7._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c1c7c2-e3b6-49ac-b4b3-62e1469eb4ac/jazitas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 5336 bytes
SHA-256: fb84afd73770a6b71319cf0f10f55714c629ef557bea0e852d3d1859d39d7067
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10532 bytes
SHA-256: e70d77e376c1968be5ed82cc7f6be320cbd3efb2d29d11a8e7943875455bf68e