Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64d354761042566…

MALICIOUS

PDF

89.7 KB Created: 2020-12-16 08:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4496e956dcb8562f4f3f8dac1ef1f51 SHA-1: d351100c06702b3bc2f5e03f063ca39113f5be02 SHA-256: d64d354761042566d47911629bcd66743717c5d38522cdb6940559be4ffdfca2
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits social engineering tactics, specifically a "ClickFix" lure and a "Browser Install Lure", instructing the user to press Win+R or paste a command to view content. It also contains a mass of external links, one of which is a suspicious URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffnew.ru/123?utm_term=calculus+cheat+sheet+with+examples
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/bonanera.pdf
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/5491348.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6addb232-6417-4895-bda0-3897e9298eed/32158443333.pdf
    • https://uploads.strikinglycdn.com/files/137e6ab4-5118-49ef-8c8b-3aa1b5697b37/freak_on_a_leash_mp3.pdf
    • https://s3.amazonaws.com/henghuili-files2/tibudozenowevugevezelik.pdf
    • https://s3.amazonaws.com/kewakuko/allelic_interaction.pdf
    • https://static1.squarespace.com/static/5fc149a6a3bf4b14ababd147/t/5fc582e53c02f22b9dc889bc/1606779624840/5747347555.pdf
    • https://s3.amazonaws.com/supefujoxopubu/tovadolas.pdf
    • https://s3.amazonaws.com/pusolefosex/bifizakixeratukibaro.pdf
    • https://s3.amazonaws.com/mejados/kvs_admission_2019-_20_form.pdf
    • https://s3.amazonaws.com/xukonakefules/30237385641.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012356.bin
c2dcaabbc08dba5ec471647a69abd1dfd8d1ec1a7ac86f013632048d432c0ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 5144 bytes
font_01_sfnt_off000134be.bin
cee4ab933f1726edfcf743879177f660eea70e291f3f743ecb3c21137e980ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 10920 bytes

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