Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8375640d6bf8a1…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 17:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6ffc1590f45a260c536c1906cb4fd580 SHA-1: 444384adb27260c655966bef2ee19931c3eb6b10 SHA-256: 7e8375640d6bf8a1210c06f6e304386c404ff551ed0e7687e64353f94ffa1d89
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://seumenha.ru/strik?utm_term=ar+15+rifle+case+36', is presented in the document body and is likely the primary lure. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing and trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://seumenha.ru/strik?utm_term=ar+15+rifle+case+36 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468828/normal_601abd5812156.pdfIn PDF document text
    • https://xugeguva.weebly.com/uploads/1/3/1/4/131438310/zorazapaxumad_kemisevox_tipimelul.pdfIn PDF document text
    • https://cdn.sqhk.co/xexodaxafu/hihwRic/57382698380.pdfIn PDF document text
    • https://vawirinivilil.weebly.com/uploads/1/3/4/3/134353209/wowoxekaweb_bogifel_doboxuvewuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/l1sykGM/43601725006.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/c40780b.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/consumer_reports_best_automatic_cat_litter_box.pdfIn PDF document text
    • https://cdn.sqhk.co/lukupupiba/ehhhixs/hill_climb_racing_2_hack_online_download.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/xelaxir_popez.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/idslghe/download_games_zombix_online_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fd8d46f3eccd.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/4141196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fc596982f65f.pdfIn PDF document text
    • https://xugowapowafav.weebly.com/uploads/1/3/0/7/130775127/2318402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fc5cd0c75024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_603752b1b60a7.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/lanorolowu/segipo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/64954895921.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/tiripixenufifu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/zokaduzinapapudufagafobo.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/digital_signal_processing_engineering_notes.pdfIn PDF document text
    • http://likirese.epizy.com/zukabiwafezodipolam.pdfIn PDF document text
    • http://notewewagegev.rf.gd/puroteridolapuresebesu.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_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 5360 bytes
SHA-256: fe46574ed2d964a8067c64b9a0d2374e87e083da5a865ebbdcb494d571528d8c
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10660 bytes
SHA-256: bffaebf42c893101a7caea851c0bbd98a0ab594eef52057cc441e8a44183bffc

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