Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a3f2cb7c1013e3…

MALICIOUS

PDF

73.9 KB Created: 2021-03-31 15:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 915561c90a1cd41555b5d7ae4930d851 SHA-1: 7dacac6ea17b0fc8d1ca1a01ec5d94c21a670c15 SHA-256: e5a3f2cb7c1013e3cc210e1786bef1141dd91099c2f76632beffe82abc85ef3e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with SEO-optimized slugs, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious websites.

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://kuzutuzo.ru/wix?keyword=north+africa+map+in+gth+grade+math
    • https://cdn.sqhk.co/zetanitanedo/jhhiVbJ/34493081307.pdf
    • https://cdn.sqhk.co/bubuzibiv/iaWbfgd/fepabuvanufililumat.pdf
    • http://saxobupazes.sportsontheweb.net/how_to_fix_proform_elliptical.pdf
    • https://cdn.sqhk.co/wuzosiboweja/N3gjW8E/skater_boy_clothing_brands.pdf
    • https://cdn.sqhk.co/zuboxizip/kshegdv/axiforma_medium_font_free.pdf
    • https://cdn.sqhk.co/turaxulefa/hficLCz/91822538630.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuzopejorexa.onlinewebshop.net/romaine_bilingualism.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_e72ac1325ac0430a93c338829f0db493.pdf?index=true
    • https://s3.amazonaws.com/difigomisosak/mainframe_ispf_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/lurutopobi/how_to_cure_chilblains_on_hands.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_f3047f77e472458fad5ab42a48fe93fb.pdf?index=true
    • http://vebagakid.onlinewebshop.net/60562667737.pdf
    • https://s3.amazonaws.com/joterige/head_first_pmp_latest_version.pdf
    • http://dusameferadulo.onlinewebshop.net/le_verbe_etre_et_avoir.pdf
    • https://s3.amazonaws.com/kodipopujufipig/properties_of_pure_substances.pdf
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_9ca9ed4ca5fa47ac9dd9db31909e0865.pdf?index=true
    • https://s3.amazonaws.com/gisujubolidine/sex_and_the_city_2_soundtrack_playlist_download_mp3.pdf
    • https://s3.amazonaws.com/xepululejiwof/tutugipudepewe.pdf
    • https://s3.amazonaws.com/zunaduxa/bail_application_under_section_437_crpc_format.pdf
    • http://vumamuv.myartsonline.com/23377794013.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_93887ba848664371816ece15c159a90a.pdf?index=true
    • https://s3.amazonaws.com/fifuto/27572127881.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c8.bin
d9f31b2677737f9206c46682d2f3e2001a71da78cb5f385943bfb4dbb3857f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 5116 bytes
font_01_sfnt_off0000e904.bin
ae4acefe7f0eb711f7611f08501221d0c029252550850d4b97e030a14bc1748f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10272 bytes
font_02_sfnt_off00010c0b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 4324 bytes

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