Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1b842dc7d0ac9e…

MALICIOUS

PDF

67.9 KB Created: 2021-06-03 18:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c09fe147faa41cf945c08686eafc6fd SHA-1: dfaaffe6a8123f1ef316f5e731ce64f17a333048 SHA-256: 8a1b842dc7d0ac9e6caf76c76a29dd8450db4c9a2e44e1753740f7a53c164d7f
214 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, yafferge.ru, which is disguised as a search result for a movie. This indicates a phishing or scam attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=bangla+chaya+chobi+movie
    • https://penosemoboz.weebly.com/uploads/1/3/2/3/132302809/5720366.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_600adb326e146.pdf
    • https://ruwegevenimeva.weebly.com/uploads/1/3/0/9/130969935/f2bd6c9f.pdf
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/5496489.pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_60695468d7475.pdf
    • https://tovagaru.weebly.com/uploads/1/3/4/5/134587520/zuwinaletoxeru.pdf
    • https://zejuraxarobepek.weebly.com/uploads/1/3/1/4/131407797/wiporesevidol.pdf
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5fce611fb1f1f.pdf
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fcca6bb0d123.pdf
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/kipuxixelarinixud.pdf
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/topiju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bfbdda7a-ef4f-410d-a49e-f87f3ae90154/1686194236.pdf
    • https://uploads.strikinglycdn.com/files/885c17c0-a836-4e5d-8762-bd7149d7634d/what_are_your_greatest_strengths_and_weaknesses_nursing_interview.pdf
    • https://uploads.strikinglycdn.com/files/42670312-408b-4cb5-9e5d-281da2e3ac86/ciencias_naturales_3_primaria_anaya_pieza_a_pieza.pdf
    • https://uploads.strikinglycdn.com/files/1cfee1a0-72dd-48b6-9bad-587d03e296f4/my_hp_printer_will_not_print_text.pdf
    • https://uploads.strikinglycdn.com/files/595d4359-1152-4cd4-9821-6e5b058429d4/what_order_do_you_watch_pirates_of_the_caribbean_in.pdf
    • https://uploads.strikinglycdn.com/files/e344a366-4bee-4904-91f6-b608121eb775/what_size_weighted_blanket_is_right_for_me.pdf
    • https://uploads.strikinglycdn.com/files/41c59fec-5b76-4315-8540-8ea97adb12c7/45228277284.pdf
    • https://uploads.strikinglycdn.com/files/8c7755b4-84b5-4bfe-a562-89726af6a1bf/facing_love_addiction_download.pdf
    • https://uploads.strikinglycdn.com/files/931f09f0-bef0-4ee0-98d2-cdab64085e16/zaroka.pdf
    • https://uploads.strikinglycdn.com/files/d9cb0eff-7ce6-4c50-b213-16dc881f6b41/gupawuve.pdf
    • https://uploads.strikinglycdn.com/files/dd5a282c-f87d-438b-8543-f0bd58671498/38263005725.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef0.bin
8d38c13e0ec64457ef126b30f4a41a809cebe03c42b7c0a7d2aaf97803afbdcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 5288 bytes
font_01_sfnt_off0000e0dd.bin
58db7142997f1a8070f88d50ff8213bff191f22bc3f4e6fb9f1f3ab28d36ef3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 9824 bytes

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