Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b1f06320a1067d…

MALICIOUS

PDF

72.1 KB Created: 2021-03-01 20:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 343bd83bf837a1c1fcb2a0bfc127a6e5 SHA-1: b56e31aef6ecf4930b41688bcd144943dc985197 SHA-256: 98b1f06320a1067d960d7ae6c979a22decb24a092602745eebdd7f1ba824198e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure for a 'free download' of a flowchart creator, which is a common phishing tactic. The embedded link redirects to a suspicious URL, and ML classifiers and ClamAV strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URI heuristics point to a phishing attack.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/123?utm_term=flow+chart+creator+microsoft+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418000/normal_600ab01aa76de.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/pibRijL/radio_italia_solo_musica_italiana_in_diretta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5ff2758f09e6c.pdfIn PDF document text
    • http://gunepevoxop.66ghz.com/because_i_could_not_stop_for_death_meter_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_600ac62fbdf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64b6fdad40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fdd69fb1f55a.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/zafaronivaj/gekinugakakudevovajo.pdfIn PDF document text
    • http://guxajez.rf.gd/24901953505.pdfIn PDF document text
    • http://pokezuturev.rf.gd/job_interview_questions_and_answers_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/95524830323.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/jagigepefinilitabemuna.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/formal_dress_hire_nz.pdfIn PDF document text
    • http://pabenikazugaj.rf.gd/dabox.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5308 bytes
SHA-256: 6710e10cca02623dfb4075e035032c1ab530422f58f26a0fb1213250eda21f2d
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10384 bytes
SHA-256: 29a970900c45fac858c07c9319c55c01cf1d1b2ed8f0a43fd14fe0ebe355447c

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