Malicious PDF — malware analysis report

Static analysis result for SHA-256 708408a30b5e1c5b…

MALICIOUS

PDF

89.2 KB Created: 2021-03-06 15:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2911842b89c9e49a2d7cacf162688c19 SHA-1: 9946ff6b638c4fd0016c2106c76cdf6abe476186 SHA-256: 708408a30b5e1c5b28948125b634105b304dfee6ada8b27b26d05d6d0bad4d82
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://jumiwimov.ru/123?utm_term=how+many+pages+are+in+trials+of+apollo+book+4', is associated with the document's content, suggesting a lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://jumiwimov.ru/123?utm_term=how+many+pages+are+in+trials+of+apollo+book+4
    • https://cdn-cms.f-static.net/uploads/4380540/normal_6040005e5b270.pdf
    • https://static.s123-cdn-static.com/uploads/4411686/normal_6004e86a22eab.pdf
    • https://cdn-cms.f-static.net/uploads/4388611/normal_603dfa79580f6.pdf
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fde7f70e08bd.pdf
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/40c878665cd9e.pdf
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/tikererijefewin-vanuj-monekivurob-satazajij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1f35544d-23a5-46f4-93d9-7fa3c2e155e5/fiforujinemefaladulo.pdf
    • https://s3.amazonaws.com/sajezife/wegovagin.pdf
    • https://uploads.strikinglycdn.com/files/f9b112b3-14a1-4536-ba27-daa214f663de/nixijuvo.pdf
    • https://uploads.strikinglycdn.com/files/3e92f218-93d7-40d9-89b0-fd37f5feb649/gelugamonotakeme.pdf
    • https://s3.amazonaws.com/gekixadonuru/the_laramie_project_character_summary.pdf
    • https://uploads.strikinglycdn.com/files/c71f1c76-a2e1-4cd9-ad65-e860cda07578/what_is_a_computer_science_class_in_high_school.pdf
    • https://uploads.strikinglycdn.com/files/73a23d79-eba4-46f6-91b6-eb31b6d1dac0/16486143252.pdf
    • https://uploads.strikinglycdn.com/files/7866c0f9-03db-4477-864f-250901598abb/sony_icf-cs15ip_remote_control.pdf
    • https://s3.amazonaws.com/xanunafojuloki/android_studio_linux_minimum_requirements.pdf
    • https://uploads.strikinglycdn.com/files/83797ad0-c08e-4ef5-a108-66b0fdbfc12a/sovolowevi.pdf
    • https://uploads.strikinglycdn.com/files/978f1338-0fdb-4657-ad52-8800428b7f79/hamilton_beach_rice_cooker_recipe_book.pdf
    • https://uploads.strikinglycdn.com/files/04a341ef-7767-40cf-ad32-1d014a564cf4/zanidevaxemijexiwijejemu.pdf
    • https://s3.amazonaws.com/tobobowu/oxford_dictionary_for_windows_10_free.pdf
    • https://uploads.strikinglycdn.com/files/95ab7186-df05-4b35-a327-277154730810/butusibevema.pdf
    • https://uploads.strikinglycdn.com/files/a62dd431-f41a-4d3f-a25c-262f95cb9d94/kadejulizutalezegarofev.pdf
    • https://uploads.strikinglycdn.com/files/9b03cfcb-479e-4fed-9dc0-103cf43be548/how_to_find_the_ip_address_on_a_lexmark_printer.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_off00011f56.bin
b6e131fa0885a8036f6dfdca42e41237974e37dce0b4ed12373c30682d7c49ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 5668 bytes
font_01_sfnt_off000132ae.bin
11e8b7d93ea6a14966312d531519d25645d23b5ebf5891fc39ff1132e712baa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 10568 bytes

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