Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829d2749d11f275…

MALICIOUS

PDF

66.8 KB Created: 2020-11-20 02:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 732150f135b8a6bfc1d849e5d7d3dd28 SHA-1: d4acd1adabaaba4bc38434332eeefa4cda30162d SHA-256: e829d2749d11f2754fc0ae64fbc32fd8c65632853b80ba8098063fa9f5d9df0b
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 pointing to S3 buckets with benign-sounding filenames, but also includes a link to 'trafftec.ru' which is flagged as unknown. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting a link-farming or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=guideposts+daily+devotional+online
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/kujirabejojo_foduxuputa_runeni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wonoti/agneau_de_dieu_messe_de_la_trinit_partition.pdf
    • https://s3.amazonaws.com/genedonapubefe/compliance_training_group_answers.pdf
    • https://s3.amazonaws.com/jufowokedunod/dropbox_plus_apk_free_download.pdf
    • https://s3.amazonaws.com/remeranexe/xogex.pdf
    • https://s3.amazonaws.com/wefadep/almost_blue_sheet_music.pdf
    • https://s3.amazonaws.com/wizidimawag/proxy_bypass_list_format.pdf
    • https://s3.amazonaws.com/julaxel/ines_zemaitis_aprn_middlebury_ct.pdf
    • https://s3.amazonaws.com/panalipolifod/97631724932.pdf
    • https://uploads.strikinglycdn.com/files/b2f0bbf5-7cd9-4025-844e-4b01f78cf5eb/zizoruxekamapubus.pdf
    • https://s3.amazonaws.com/gavobawum/85072477202.pdf
    • https://s3.amazonaws.com/henghuili-files/kudaxukunepiguke.pdf
    • https://s3.amazonaws.com/lupebesu/95248629537.pdf
    • https://s3.amazonaws.com/geradi/12766142757.pdf
    • https://uploads.strikinglycdn.com/files/61ec906f-e418-4361-837f-11e00f48426f/76543425412.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_off0000b9b2.bin
e3c4fded505c85933ac200fd1e82eb067488fca67777effd5b306a7f377dfe3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 4932 bytes
font_01_sfnt_off0000ca96.bin
b7e086f863445ecc7f0429513c01d53407f0138b83bc95fc8466ddf396b9faa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 10700 bytes
font_02_sfnt_off0000eea6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 4324 bytes