Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd446c6727c9798…

MALICIOUS

PDF

64.6 KB Created: 2020-11-23 21:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a64a7c462e00e207fb04ab42eebcedf SHA-1: 166f8bc5c54bd5456f1da0f404262bdea4a584be SHA-256: cfd446c6727c979881eea80660cc3e6fb288b6de588bbb2bdb2353f1763d7dcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, 'https://traffnew.ru/123?utm_term=how+to+update+echo+dot', suggests a lure related to smart home device updates. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/123?utm_term=how+to+update+echo+dot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5fa427fb1388a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fa294706df8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fadd3ec548b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fa8a1623fb4a.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/wefoli.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/17da646d-c041-4ed3-a827-846bac1b3fef/22970596021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23830962-e014-4f1f-872d-52ef69245c65/nobody_likes_a_cockblock.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/business_analysis_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/falefotanetalofevajajero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d372a5-30a6-4037-ad84-0d48cc37fb49/39963346850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82522179-d168-4fe1-a60e-fe6b2289d3cd/33567561719.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/27315029182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052538be-8df9-46bc-a7d5-b4e024cbecec/epidemic_sound_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9769f3-5383-4f86-9a68-b994a35e02d9/skype_6.0_download.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_off0000c0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E6 4908 bytes
SHA-256: 276a0e84623dff86bd1133f22726fe4fc60429bfd06a2d1b8f9b960d9dd735c9
font_01_sfnt_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 10568 bytes
SHA-256: eabda0b2e2126d911ca4a4e858034ddfe997bf8a79454e0d2000074e3d925e4c

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