Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a9e5b7eb2a5f8b…

MALICIOUS

PDF

83.8 KB Created: 2021-02-23 03:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 08349edb37eb67948cf4a273787ab391 SHA-1: 455fab3723f0006435ef0496508efdc974c6f9fa SHA-256: 50a9e5b7eb2a5f8b75e6f0dfb3b262626570f926bae5f3d8f6a9132f5fdb734c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious or SEO-farmed domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=dub+city+old+skool+cars In PDF document text
    • https://cdn.sqhk.co/zivunegas/hfhghfD/sniper_attack_fps_mission_shooting_game_2020_uptodown.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/4261776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_601ebacab4077.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/R6e0ujb/tapiviwadanerofebamajowen.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/0yjidia/la_novela_de_patricia_teran.pdfIn PDF document text
    • http://lyudi23.ru/parallel_space_64bit_support_1._0._3042_gg_signed._apkfqdt3.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bGsH8w4/jump_on_it_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_5fd13e406e39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fd378004a766.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/how_much_does_the_news_break_app_costgdxxt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60159244e0d17.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/pipaneku/turafofi.pdfIn PDF document text
    • http://peruzaropaxox.epizy.com/how_to_open_a_sentry_safe_dial.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/71537667582.pdfIn PDF document text
    • http://kitasiru.epizy.com/convex_lens_image_formation_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/anjathey_tamil_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/15689402639.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/xomaxonusove.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5236 bytes
SHA-256: 496aa9dd371e97fedb44cdb24c52a861ae2937d42f6a0814edc0681d8d069795
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 12896 bytes
SHA-256: 8295c1791fccdf6c816f3928d90783add68d2c62abec63328817d4d22024dd4c
font_03_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16724 bytes
SHA-256: 6fece776ff8e320faa491cc594a1f76fa2ce83f5aee1a848d6889941f2ab23ef

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