Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db4d8f464a4ecf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 21:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87854f6604b3aade7492b948b700224a SHA-1: 71990d617407a8ff710c917965f5f97d5ddeb126 SHA-256: 79db4d8f464a4ecf0de176af49575d59e760e7f856dd89cd65c4158945d3024e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/uplcv?utm_term=pixart+video+editor+pro+mod+apk PDF link annotation
    • http://bijverhoeven.nl/uploads/files/83419089463.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bupajefebanujawo.pdfIn PDF document text
    • https://matrixx.lu/images/fupegoguwederipereserilup.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/dupus.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/10368981645.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/lifaruruxasusagixugixul.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/16342092560.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/jegexisakapewalolekanofuf.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/futixofugupakizeguke.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/18230387989.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/47000121572.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0809395c2---nisigojazosepimavatawev.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79589612430.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/bejetarom.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/13021935836.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/19905025923.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/16435345644.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/xilegubegigowifax.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/babofatekumobenukitik.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/gukezafiwowokevag.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4ac1bab---tixukuguminaxudipefepuf.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/sudodemisuniwugifigozi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/juligamopuruladawuv.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 18556 bytes
SHA-256: b2c814eba4eb3888aecaacc978d98dab96892720d017505cda34b1095774aeea
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 10496 bytes
SHA-256: c72da0abdbcff2d2b5bdaffdb0b65b0a1af2abaccd5bc52f47373f31f6e62161

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