Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f90bb7fa54203…

MALICIOUS

PDF

88.3 KB Created: 2020-11-21 22:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0d73bb0770a504d1dede8c5846f3b56b SHA-1: c0064143b3655df8195242e3d634ca812b911477 SHA-256: 138f90bb7fa54203d1dca9c9d6de0e3bad0da875ac32b50037669e47d0195ad5
136 Risk Score

Malware Insights

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

The PDF file contains a high-confidence ML detection and a ClamAV signature indicating it is a phishing trojan. A heuristic identifies an image lure linking to an SEO redirector, specifically `https://trafftec.ru/123?utm_term=strike+force+heroes+2+unblocked+76`, which is likely used for phishing or to download a second-stage payload. No scripts were extracted, but the overall structure and URL suggest a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=strike+force+heroes+2+unblocked+76 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f893af1f3867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fb27af15d38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f95374ed54e5.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/memul/19510641266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcad81e-e89c-442e-9198-8615f4035f68/fukomajipubukasig.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/21050181806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab236e4-719d-4c24-930e-ec6eb6d21e54/circle_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689a0cec-a6ab-4a75-91d0-057d1516ad0f/79681368409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b66514-cb4d-48ef-a47c-8701ad68ceb1/65829387666.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/47615866284.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/multivariate_statistical_analysis_kachigan.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/lomudimesade.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/butejutixeloku.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_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 5572 bytes
SHA-256: 15093613df5b3851f6a80b66d09de692817a89f681b38f8c27aa00f4c4374bf7
font_01_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 10684 bytes
SHA-256: 55b0b11c76e849c1c9652aed7e20dbef9b9cc9fd86ccc432e3a32f35d6a7cffa