Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6362753bb6a6ab…

MALICIOUS

PDF

75.5 KB Created: 2021-01-15 19:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 328bd30445e64be91aa51a19dc37114a SHA-1: dab92c2a4f02316daea6c2ee5b6c1e9b740615ec SHA-256: bd6362753bb6a6ab46c6b233e6e16bfdd878783e8b65b6073f3980ea32358810
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these URLs, https://traffset.ru/123?utm_term=tundra+endangered+species, is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

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://traffset.ru/123?utm_term=tundra+endangered+species PDF link annotation
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/0ce135b7523b57.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/13266661590.pdfIn PDF document text
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/7eb93.pdfIn PDF document text
    • https://tovisasuwuvep.weebly.com/uploads/1/3/4/5/134513775/3be3ccfb0b863.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/guvawadeza.pdfIn PDF document text
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/2254768.pdfIn PDF document text
    • https://xubupatulebo.weebly.com/uploads/1/3/4/7/134701573/75f12c8e5.pdfIn PDF document text
    • https://zozovuxogufeduw.weebly.com/uploads/1/3/4/7/134766710/2779231.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/gofiguj/minecraft_pc_2019_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/multivariable_calculus.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/azadi_full_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/shell_script_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/bbc_english_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/jimmy_corrigan.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/jovevasabejusedawuzafug.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5156 bytes
SHA-256: 57b06da7a3de77d100288d7fbb838c950ec07d15f9940197f3657fe37e31abaa
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11020 bytes
SHA-256: 4f9d81dd45c8b4328bed6bbea827e536a02bc82368ced5cffc7abc6643dc62f7

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