Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c62ebbf9d779a95…

MALICIOUS

PDF

71.3 KB Created: 2021-01-13 18:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 23060d17d0274f9eed8aa1066a5c2031 SHA-1: 326be534b2a266ed2e251bf3f68c2627588c7375 SHA-256: 4c62ebbf9d779a959d7201e1b4fe53db2aa9a0e0ea80e3ed814cfb2264b9a81a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDFs, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One of the primary links points to a known malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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=ny+giants+vs+eagles+injury+report In PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/mudagobanata-malonefisi-gijaxunewas-pimofituwurepij.pdfIn PDF document text
    • https://sixabizutobago.weebly.com/uploads/1/3/4/6/134613494/f123af2caf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_5fa95a3edccfb.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/ijheijO/71397625677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5f975e2cd72e7.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/bededuxotulapil/tujamenopepemuxalasuji.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/psychiatric_nursing_care_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/gafomopelamukip.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/speed_calculator_mb.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/checking_information_test.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/aashiqui_2015_film.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/lonely_boy_images_free.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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 5192 bytes
SHA-256: 4d66ccf02d1b3accce486ca88368b7de252a4120c648e08d5474d91d9762ea46
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 10856 bytes
SHA-256: b96979f49f4b22b99da3549d64c59d3bbab22f99d225581816658f499c2a6b87

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