Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f74e2f4a3bf61…

MALICIOUS

PDF

74.2 KB Created: 2021-01-07 10:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 074d415c7a1e257a0471a964d84a1336 SHA-1: 3969fcd5255a59da3d977199d5f1e8466b761dfb SHA-256: 8d1f74e2f4a3bf61854474bb8a9c5123b664f8fafc95d02415eb42ae32490474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan activity. The embedded URLs and the overall structure point towards an attempt to redirect users to potentially malicious content or exploit kits.

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://trafffi.ru/123?utm_term=telugu+moral+stories+in+telugu+language PDF link annotation
    • https://badoguwogodunej.weebly.com/uploads/1/3/4/7/134713378/9737434.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/b6c7d7597a6.pdfIn PDF document text
    • https://ruzudafuzozuxu.weebly.com/uploads/1/3/4/8/134847081/fumotiviwaxuxujuv.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdfIn PDF document text
    • https://wokumedepawal.weebly.com/uploads/1/3/4/6/134607606/9497753.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/b9d810a.pdfIn PDF document text
    • https://dofuliral.weebly.com/uploads/1/3/4/3/134346813/zawumat.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/6458c.pdfIn PDF document text
    • https://forovaze.weebly.com/uploads/1/3/4/3/134315943/mamebab.pdfIn PDF document text
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/4833edc1d518f5.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/midizaxopazeji/argos_online_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ab2b14-18f4-46ba-b14a-f8e04a84d300/87398482191.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/alectoris_rufa.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/act_3_romeo_and_juliet_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/tujejemip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f4676e-a961-4bba-bc81-0a111ef9396e/what_is_mdi_s.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 4956 bytes
SHA-256: c13de63863e0b43c8a92f62bee4c0afebe4defea818bc7bf746bbd43bf906f7c
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10268 bytes
SHA-256: 94d2051c861d47de0227e5d3ebc3a05aa5f6bc992a8818f0f4b0ce974caa49df

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