Malicious PDF — malware analysis report

Static analysis result for SHA-256 63231e70c4bf3651…

MALICIOUS

PDF

70.3 KB Created: 2021-02-17 05:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5177e80c8ae5990596a04252a06413c3 SHA-1: c693bf2aeb28c8f155308d97fdc15bcc8d58fb30 SHA-256: 63231e70c4bf36510949adf413df0e519da67d9dacb9699a1633d6e2e94dbcbc
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, suggests a campaign to distribute further malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a deceptive call-to-action, likely intended to trick users into downloading a payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=you+are+good+hallelujah+tye+tribbett+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5fe4700ef0dfc.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/gajazif_kiwematekudaw_suroratitu_sopikixasibuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_60084c0444547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_601f5da0c51ee.pdfIn PDF document text
    • http://mexuzekinukogip.iblogger.org/english_grammar_worksheets_for_grade_5_cbse.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/5bbd9386d065b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_6024329120d62.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/bggjhG4/k-_pop_idol_producer.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/be2f2238d07546.pdfIn PDF document text
    • https://mifevulesitiz.weebly.com/uploads/1/3/5/3/135321383/2ffcbfb67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369518/normal_6007470439d67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzafofefo.rf.gd/house_rental_agreement_format_malaysia.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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5728 bytes
SHA-256: d3e3df0b71c6d4f987d388ca91c4e43ffc79e72bcfa4dd3608b607d9833a99b5
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10592 bytes
SHA-256: ce2760ab44fc1c08e7604f20ab3bca35c4551d304ba18fe5497e961250eee46e

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