Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c9f34f6b6108a…

MALICIOUS

PDF

107.8 KB Created: 2021-03-28 05:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a4523a1d7f504451c91d1009bb8cfa SHA-1: bd701814f0d42581bbc4bc176bd21b6eeffd82a2 SHA-256: d54c9f34f6b6108a900a677ab0b6effb7dc3e233bd482e677de0c162593b8ffc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is resalured.ru, which is likely used for phishing or to serve a second-stage payload. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=bar+to+psi+conversion+chart+pdf
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/5502499.pdf
    • https://cdn.sqhk.co/rudugebakivo/dZFjhjc/nazavaba.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/5279955.pdf
    • https://cdn.sqhk.co/matelasoguje/hgjfjLl/infamous_game_movie.pdf
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/gebemiwinadiz.pdf
    • https://cdn.sqhk.co/fafegatoko/zgdidpI/sefidojafove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bipepezuwed/python_machine_learning_raschka_download.pdf
    • https://s3.amazonaws.com/pusolefosex/87697396213.pdf
    • https://s3.amazonaws.com/rurosaveruk/answer_australian_pronunciation.pdf
    • https://s3.amazonaws.com/bupaxomu/how_do_you_set_a_homepage_in_microsoft_edge.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_7ce0ddc1412b4c988789448169adc6e0.pdf?index=true
    • https://s3.amazonaws.com/somisilegex/41747039089.pdf
    • https://s3.amazonaws.com/satudifin/9754889008.pdf
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_322db20695064341a64c827f45411243.pdf?index=true
    • https://s3.amazonaws.com/salosibejodod/59530151987.pdf
    • https://s3.amazonaws.com/loneminovu/what_is_the_call_of_cthulhu_about.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f8d.bin
9c1905c92f8f43e0c466a478714f286f37f822a5e3220fa60bc8d69ebc156d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8D 5108 bytes
font_01_sfnt_off000170e5.bin
5f739335c351ca0aa7d98f236bdbb99631b89905b58b90b66bdf1da9bda9a0b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170E5 10148 bytes
font_02_sfnt_off000193aa.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193AA 4324 bytes

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