Malicious PDF — malware analysis report

Static analysis result for SHA-256 c560bf43be42aa70…

MALICIOUS

PDF

72.6 KB Created: 2020-12-25 20:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d531216623f6b2b84c7dd37435bb229 SHA-1: d020ffdecd6e059d421bc59869cb1ac0a10ef846 SHA-256: c560bf43be42aa7064eab806fbaaa8a2e631362f01e31276d5fab002c7c27157
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 heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=weather+report+in+guntur+amruthalur'. The document body, though heavily obfuscated, contains text related to a weather report, suggesting a lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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://cctraff.ru/aws?utm_term=weather+report+in+guntur+amruthalur In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5fcaf85817e54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fd05ffb417af.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/694fb040-188d-44ba-9ab4-bd180c79eb66/rojotidiwelaraxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2073341d-a3e7-4601-aff9-14a4be719e7f/oxygnothrapie_soins_infirmiers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a51ec8-e3c2-452d-bc70-94e70289c164/13555898331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bf369b-2acd-46d6-b2f7-179dfc5ac071/hots_sgt_hammer_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1aeecaa-cb01-43f3-b813-a723e60d5382/wumivuwoxakisumate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77114b13-21c1-448e-9b60-bc12ec5f824d/xafoxevisixamevamud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b537167f-ac6b-435f-a210-7f459d401f64/we_live_in_a_beautiful_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a54967-a0b3-48d1-8e2c-b49deb8fe9ef/vuwiralerojegavimepapabim.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 5068 bytes
SHA-256: 777ad736bfab97e0e7963034d23e801350bf755255b18fdc23ea43887d3575bf
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10780 bytes
SHA-256: 527de09226c35a465ab48f51cafbda68a82f73d66434f20366418708fe2192f0

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