Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac13eef6bc13bf1…

MALICIOUS

PDF

87.1 KB Created: 2021-02-11 16:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6dd7e294151da8e75190a77dac88514e SHA-1: 88c3d40bc52662ebbb482bd733aa9532aa344dd5 SHA-256: 3ac13eef6bc13bf142e9f4dd7c3ea7f7e7fbb8d3ca249c3bf74b4c35c0c61548
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=terraria+moon+lord+guide+deutsch PDF link annotation
    • https://cdn.sqhk.co/pivokazi/jcGjj2q/29128369802.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/13473262204.pdfIn PDF document text
    • http://rufefoj.iblogger.org/8816544879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegipufi.rf.gd/reworedasanuw.pdfIn PDF document text
    • http://zegifuf.epizy.com/cartina_turistica_cagliari.pdfIn PDF document text
    • http://bopagit.rf.gd/twitter_web_font.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/rezidawevadulapunapefemu.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/jisovox.pdfIn PDF document text
    • http://timavutiziv.epizy.com/amablesser_cover_song.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/plague_inc_apk_ios_free.pdfIn PDF document text
    • http://kojexeruxub.epizy.com/29724987236.pdfIn PDF document text
    • http://kujafugakare.epizy.com/brochure_mini.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/organizational_chart_template_word_free.pdfIn PDF document text
    • http://jabowedufup.epizy.com/morexenusumavofamek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 5300 bytes
SHA-256: de1429a73bcc00105af95fba9a99f14b7f83ae797a38b34d0328a347d164c077
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10792 bytes
SHA-256: ad990f0c45771b0d4a755af2622cad62a1c1b8c53f4e50dd991ab84f3d8adda3
font_02_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 16076 bytes
SHA-256: 0bc8c5047d2d2a2c3d6173fe1096866696c7e485310979845edc7f694a03acec