Malicious PDF — malware analysis report

Static analysis result for SHA-256 250491191510ae90…

MALICIOUS

PDF

100.8 KB Created: 2021-05-24 04:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d2d4fe3c5169d6732878175959f5505 SHA-1: aaace5464c65465584f3ac880658efb1076618de SHA-256: 250491191510ae902d36fed0a0e02abebeb87370e5a621d03710e043dd034080
144 Risk Score

Malware Insights

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

The PDF contains a lure suggesting a free download, indicated by the 'Image lure linking to an SEO redirector (free-download phishing)' heuristic. The embedded URL points to a redirector, which is likely used to serve a malicious payload. ClamAV also detected this file as a phishing trojan.

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
  • 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.
  • 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://bologen.ru/strik?utm_term=endoscopic+ultrasound+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fd7e2ac8933d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495837/normal_5fc7e78924e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fd1b5bf8c86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_5fd774985369d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fd81a4bcf062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_605018d827db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388285/normal_6003d1b2efb1b.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/tomaxade/sisogezelija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15303e2e-009b-43f3-9744-214b6b829d04/74267694955.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/compreender_o_behaviorismo_baixar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfea74a-e59b-49f4-be3f-5a22491473d6/35833856071.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/sudoku_medium_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a97abe1-e2d1-4f15-9fc6-7e77797c79d1/tesef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a571c163-fed4-489d-99fd-27bf76f54980/larson_calculus_10th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ee8607-ade4-400d-839f-70da16eb2878/14518122534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ddc4da-dec0-47e6-a40c-d2a54be838c3/36058331901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4d0136-451e-4747-8d91-bffc739dfabf/45666832943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cec60f4-b890-4b05-8b0f-bab44e1e6d33/international_finance_center_surat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ff3f9c-8706-403d-af05-9abe18330e52/91321680599.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_off00014be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE2 5312 bytes
SHA-256: 55df31a0e221928bf8407440d5f34bf0650e08822b77b8f0ab70eb55af075b7d
font_01_sfnt_off00015e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E00 11764 bytes
SHA-256: daf461b5c9f77e4e7ed09ed1998f51612f378ca49be5556e4d5943b8c75a641e