Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a28a4bad5bff5e7…

MALICIOUS

PDF

76.0 KB Created: 2021-02-17 02:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b807d42b823676771063b383dd0e0fee SHA-1: 3ca64e2497c11a3f5a8ab1e36caad1fa6601296a SHA-256: 8a28a4bad5bff5e726339f55c1a7f995565c283f2215547d4694932c03301477
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'how to fix ge washing machine' and references to wkhtmltopdf, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=how+to+fix+ge+washing+machine PDF link annotation
    • https://cdn.sqhk.co/widiroje/he0bkgj/98080395236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fefd3156f1a1.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/deKijhh/kobesi.pdfIn PDF document text
    • http://erethiztzj.space/mifud8y6rj.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzijaxab/p0iek8p/1_pics_1_word_what_the_word_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/iinkie9/soccer_3d_print.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bhh2PpA/70555710039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484624/normal_5ffd0c37ce600.pdfIn PDF document text
    • http://olipaka.xyz/create_apple_id_in_androidf1pcs.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/bajapovogam/juwen.pdfIn PDF document text
    • http://wikilupari.epizy.com/affidavit_template_family_court_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/soundcloud_er_high_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/76027649558.pdfIn PDF document text
    • http://sesunofopum.epizy.com/58255177643.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/zakaramotarupi.pdfIn PDF document text
    • http://vafegenowakimo.epizy.com/hulk_meme_endgame_template.pdfIn PDF document text
    • http://tubafuwasaxa.epizy.com/microsoft_office_2016_64_bit_installer.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_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 5288 bytes
SHA-256: 6776a78888e6fe95a885d6c2a2dcdb04794ef0338c38395fd6e7b51a838f318b
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11308 bytes
SHA-256: 710095784fefa0b03946835919f85fb1d3ad239847005375e0d8487379f4aa82

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