Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d55bb0d21ff124…

MALICIOUS

PDF

75.8 KB Created: 2020-11-24 00:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9c4848009edb2c58aca1fa96515975b4 SHA-1: fe1bc36dbb361372862b37d4c535fbddfa1f53ee SHA-256: 55d55bb0d21ff124b5e23e4e7d251d79b9fca03d285c390934fa28e037997b28
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the primary purpose is to direct users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • 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://ggtraff.ru/123?utm_term=electric+scooter+wiring+diagram+pdf In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/9562dde99d.pdfIn PDF document text
    • https://mutoxikaxinabab.weebly.com/uploads/1/3/4/8/134886861/fomuded.pdfIn PDF document text
    • https://zupusifeduligam.weebly.com/uploads/1/3/4/3/134313264/pumolesit_vasopojunuse_tezobiperukuzat_ladew.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/tezofuretejom/latex_mattresses_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/vakeku.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/8355054320.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/mapanuzeku.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/bigazogejefopajedin.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/sound_pollution_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/49227382934.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 5524 bytes
SHA-256: b245b727800823fd01f12f8e01153b6f1289af620f7480f0339588beef44b23f
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 9980 bytes
SHA-256: 058520fc058f1343430cc107bcb1ccaecba5e7a9829a5dc01274e6c948f884de
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16060 bytes
SHA-256: dea42a645509e47913d94a3c1ff2e7ffecf6ca7e8d06e08a5f86f932263db97d

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