Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf52f9478b13979d…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 03:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 323b71917c16baf74e042fc68787668e SHA-1: 51981938e875924d46a6eff306f4a2fa0592bafd SHA-256: bf52f9478b13979de560f101de2cdb45972a3cfb5f84346499bade9c91212dfc
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://jacksth.ru/wix?keyword=car+locksmith+grapevine+tx PDF link annotation
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/fejobeligu.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/TG0eEhb/58776686867.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/vidikod-tumubunojirazef.pdfIn PDF document text
    • http://jokebixa.22web.org/sivoremedipebo.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/6324eb15c.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/8iiggqK/50599350229.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/d796ccf7ba98.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/pakutopojevenupov.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/tokafanawa/rejinitaposexevalogep.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/puffin_browser_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/amman_pictures_to.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/identity_access_management_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/70181440022.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/packet_tracer_7._2._1.pdfIn PDF document text
    • http://jeburam.epizy.com/oxigen_wallet_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/bangla_calendar_apps_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/supotina.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/cons_of_school_uniforms_bullying.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 5444 bytes
SHA-256: 2e96fff2ec0bfe0d934f6960dcbc64d55e3773e5aa658b1c67ba00311e10b4ac
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10596 bytes
SHA-256: b5651fbac7727bd186018b84756c84c0bd72d3373e19272fb971e41784f14722

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