Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd872b47c87f3e4…

MALICIOUS

PDF

74.1 KB Created: 2020-12-15 15:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b80c9a21c5e445957d702991b7c5d246 SHA-1: 92ba8452c30eed50fee430efb770568b349d857d SHA-256: fdd872b47c87f3e4ff9dd1a159421f5b8a5d059eac82ac85cb555d962757b915
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains a link to known malicious redirector infrastructure. The link, disguised as a free download, leads to "https://traffine.ru/aws?utm_term=100+civics+questions+and+answers+pdf", indicating a phishing attempt to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=100+civics+questions+and+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5fb2a865d0774.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/aa0e40a5ef4215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f87d2edb2ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_5f9512e1c24ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_5fb4cadb2ccd2.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/3381ebf47c6f14e.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/tedopekuretaz-fifulupotu-saxipukimilo.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/9574538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fa6eaaae48b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fd6005ad5ffe.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/batoragubukepo/madugunuwafosibo.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/number_wise_marksheet_hsc_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/bleaching_process_in_textile_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/answers_to_home_link_5-6.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5492 bytes
SHA-256: b6479d54e6935ee070911d9d8aebc3efa7518a840369867fcb306fdfdd23bc90
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10664 bytes
SHA-256: 2ff11ae3675ccaa021aeceb181bee1be3b4d98c963421d93de48c1e8505b8ce0