Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23af6c89fa428c0…

MALICIOUS

PDF

89.0 KB Created: 2021-02-22 18:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 48cde6b87f17dc4a56f0205e0be2d775 SHA-1: b8d329407986eab1cea29cbe7d529f23dfaeab18 SHA-256: f23af6c89fa428c07ba3a27b1a78f44085ceef98fe8815f302a1efdd8f97d059
156 Risk Score

Malware Insights

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

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=livros+espiritas+em+pdf+para+baixar+gratis PDF link annotation
    • https://cdn.sqhk.co/pinofizulag/hehhyno/guide_safe_notification_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/Nbsjfij/viruses_are_alive_because.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/ieZjyhd/58801727232.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/gfazhe2/dragon_ball_super_battle_of_gods_full.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/c6icpid/josorotuvo.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/2873973.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/geXhcPG/breyers_ice_cream_vanilla_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/3NASER2/mezevamebitolag.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/8b5f91aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/ic9HjjU/tavasowivepibisetelam.pdfIn PDF document text
    • https://cdn.sqhk.co/kanonilabepi/ohjQvsh/shelter_insurance_agent_login.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/zomuzigo/lagu_pekerjaan_beruniform.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/bnp_mf_factsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/guronakememedumo.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/bionic_commando_rearmed_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/serofepinunazawisigepaj.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/deerfield_il_police_report.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 5536 bytes
SHA-256: bc754a13495086facdd10dc8d48e0bbe2c3d6ff6ca04125e54125c109b69c521
font_01_sfnt_off00012cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEC 12936 bytes
SHA-256: 636de45860188d195c73ad888ccd6b65cc3bebbfce97646281fe2afb736be62d

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