Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61eddf65c1f80d…

MALICIOUS

PDF

78.7 KB Created: 2021-05-22 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4bf1e8e2b915ca651b894c2c5bc6615c SHA-1: 6c5ec6216c0464a6c8406eab3caa3e42901ff36f SHA-256: 9a61eddf65c1f80d51cd8a5fba3a78c5032015650db21b89ec81012d41a4b3b9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is likely used to lure the user into a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=the+selection+kiera+cass+tv+show In PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_5fc9bed48f9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_605dde036d9a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fe51231e056d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_605cdcab177ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fe411a298ded.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/7574736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fdd8eb9f033a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_605a577dee391.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/39640458ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5ffcb94f10dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fd1efc51b6eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_6067876edbe03.pdfIn PDF document text
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/f06d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4806ebc-2c0d-4e2e-82f9-33f006b402ed/7738424077.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/blackberry_z10_link_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26ecd5d-449c-484d-9870-d839be9312cc/how_to_do_multinomial_logistic_regression_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/14136365906.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/twilight_saga_eclipse_rosalies_story.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/extent_report_jars_version_2._41._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0005073-3910-485c-8ce7-0ac3ae7194a8/68226923352.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/85024813975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662f10db-69a7-4059-9098-4563c040d48c/85758704302.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5052 bytes
SHA-256: 47b93aa2201b018de681ae2b971ad15c5732273e4ce66c5db7eed63216f18f81
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 11412 bytes
SHA-256: 2aedd69585d56d772e7a489ded3dd7fdc28c1a479ec877458e2c26a99dac8848

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