Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d4cc0d1405dd6…

MALICIOUS

PDF

68.2 KB Created: 2021-02-21 13:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cdc2f1d15f5805fd7ce783512f4eb44b SHA-1: a9e797da9bc82a516e9f948f06de2211487bbe3f SHA-256: b45d4cc0d1405dd621f5584b19320e3ac410425fb4a1d6d1b3d5fc2c6ca15a84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The primary external URI, 'https://baarspo.ru/strik?utm_term=what+is+the+best+mange+treatment+for+dogs', is presented as a search result, likely to deceive the user into clicking it. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+is+the+best+mange+treatment+for+dogs PDF link annotation
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/019492f1101c6.pdfIn PDF document text
    • http://amsidisi.xyz/malarojumokefetuu9kp6.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/kerugijepox.pdfIn PDF document text
    • http://ostanni.fun/41092468961h7u1v.pdfIn PDF document text
    • http://topdiscount.pro/xmas_party_invite_templatesubgj2.pdfIn PDF document text
    • http://about-igsupport.com/83454465342tz4ox.pdfIn PDF document text
    • http://everydays.space/information_about_annular_solar_eclipseq80lv.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/rerugevof-xagola-gidorijiza-lijuwago.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/jatejubaki-tibipazonova-tebulojapefarav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5fe4257d8a752.pdfIn PDF document text
    • http://bedusopuzal.22web.org/neluzejuvavojasipixoj.pdfIn PDF document text
    • http://nepojar.22web.org/data_aggregation_platform.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/sefiwegegagu/96407301963.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/how_to_setup_wireless_hl-2270dw.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/accurate_battle_simulator.pdfIn PDF document text
    • http://xuzujokavagud.epizy.com/4241463523.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/63402292786.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/babette_s_feast_movie_free.pdfIn PDF document text
    • http://mezomiwewelebe.epizy.com/acethinker_video_er_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/this_christmas_donny_hathaway_sheet_music_free.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 5440 bytes
SHA-256: 883bb8c39d5b20f26ae4ec80e1a5a6cb510fea3409e0877a02d480d40cf72aca
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10356 bytes
SHA-256: 81a5cbe02431526ebe5d43df6010fe47cb765afd545fcb072c5be73332576c3d

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