Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f8ab56411998f0…

MALICIOUS

PDF

86.3 KB Created: 2020-12-27 23:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8685c90874c55d2ed35f9c0493b53ba1 SHA-1: 94f684bc1016d73b6846a72a7a387add008e1df7 SHA-256: c2f8ab56411998f01d041fb43f494d080ff42be289df6a1e6c6829d746e59403
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a callback phishing or tech-support scam lure. The embedded URL `https://traffset.ru/123?utm_term=2014+nfl+schedule+results` is a primary indicator of malicious intent. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential for embedded malicious JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?utm_term=2014+nfl+schedule+results PDF link annotation
    • https://cdn.sqhk.co/merodobiweve/1yjeDqo/galaxy_bowling_3d_free_mod_apk.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/jjdgctk/mermaid_photo_backdrop.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/bepegemufixi_biruzaget_nulebibubajobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_5fc0d58b0eab3.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/ghhfhhX/lolilijeburan.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/Ajihfi5/woloxamenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/355184a1-acd0-484e-845a-4d4d7c7d698e/a_space_cushion_is.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/aruppukottai_akka_ponnu_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/iphone_wallpapers_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/83523168160.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/nutasoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/android_pay_limit_singapore.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_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 5220 bytes
SHA-256: 621586a965e9874558ea57d08b82e7f0118b9b3fb457f29ff2e692dfad486f95
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 11928 bytes
SHA-256: 7042d04659e43b32a28393fad788fb5d93e6dc11c1805690e0f52029cd5992d4
font_02_sfnt_off00013776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e

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