Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c7f8f9fc2426d9…

MALICIOUS

PDF

96.1 KB Created: 2021-01-06 07:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5fbec4043213abcc12b57239183a56a7 SHA-1: e2e7455ef192c4c04c8ea702062c2d82aeec71af SHA-256: 19c7f8f9fc2426d9270bf4eb9f3205802c701037262833644bc29995d3b02699
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic suggests a phishing lure designed to trick users into downloading content. The embedded URL points to a suspicious domain, likely serving as a redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=load+bearing+wall+construction+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fae7f3c068bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fbdb6f428c73.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/Ihcogee/zipewunerubujomijujitox.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/fajujiju/valores_de_antigeno_prostatico_especifico.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/98505440757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95105342-c38a-4eaa-85b6-8044eaabf4c6/hot_kiss_whatsapp_status_video_share_chat_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/reservoir_induced_seismicity.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/96609682727.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/best_water_softener_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6041af-d114-4968-97f1-ae1e0d2d931f/donadanofajajaxofisilake.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/rarijofovesawiworekovo.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/armature_winding_of_dc_machine.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_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 5496 bytes
SHA-256: e2b908156a92be242e28942056806d6064a57822acab5ec9a948293d354be34f
font_01_sfnt_off00014e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 10824 bytes
SHA-256: ef6fff2a604d1fda53ec43413377ad9ec7bae23ede8a63ee1f000c07e248d1a9

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