Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9ebfd6289d9886…

MALICIOUS

PDF

87.2 KB Created: 2021-02-20 23:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 59c2062ce4346000ce128269f2c3cf11 SHA-1: b5d0a8033db8f39ba06f927147896f1de30f8e2e SHA-256: ad9ebfd6289d9886d7fd30e5ba3acb056d082e4c9c751f36be57d97bb749d357
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://jottigo.ru/strik?utm_term=2004+ford+focus+hatchback+problems PDF link annotation
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/bemimuminipusasejul.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/punusijunaxo_kaxapafedugi_daduvanemixo_tuxeposuju.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/iUy6YY2/complete_music_reading_trainer_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_60199d669b3bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_6005078c6fd24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dowadotiju/cours_atomistique_en_arabe.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/kalevu.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/singular_and_plural_nouns_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/kohler_shower_faucet_installation_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 5592 bytes
SHA-256: 2c17c13d385f75689691aa1009e6e0e8de1a0e6e4ace11c9991456e85d667412
font_01_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 13068 bytes
SHA-256: 69fa583ab0b8709ec231fdb00f02fc56a2966c31073080c63a322cc8940dd3fd
font_02_sfnt_off00014229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14229 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2