Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ed704bd9cd1789…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 02:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c19cf2e8e476265105b2012976c24f82 SHA-1: 7d6a97eb8dee02789a8dfcadfea19de65c3cb9e0 SHA-256: 76ed704bd9cd17892298c1573696f5b15e07f705873ac2f860c5777d50a8e848
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=why+does+my+samsung+top+load+washer+smell', appears to be a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://kuzutuzo.ru/strik?utm_term=why+does+my+samsung+top+load+washer+smell PDF link annotation
    • http://manekobe.22web.org/gavevip.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/gizepekiwesig_pebef_noledowamo_viradamoban.pdfIn PDF document text
    • http://zageketukux.iblogger.org/hp_photosmart_c5280_all-in-one_manual.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/05316b35f237.pdfIn PDF document text
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/ditigewavile_duxogamevive_bigogewurolu_mizifugi.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/8997771.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/80590c9d35562.pdfIn PDF document text
    • https://renibopasuviwi.weebly.com/uploads/1/3/4/3/134305424/92c49b055c150.pdfIn PDF document text
    • http://lujefepoma.iblogger.org/73528416542.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/710eb306a3.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/fekaduvopigab/archpaladin_class_guide.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/driver_genius_professional_18_crack.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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 5580 bytes
SHA-256: 5065d0081b7486d96b8735d37bc46a72010ac0e50752e4ede5b95af304603049
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 11300 bytes
SHA-256: c5c75ae7c0d21f0e44e9810b5b9975b82ff83387eef047db16d165e1790a6b4c

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