Malicious PDF — malware analysis report

Static analysis result for SHA-256 28205935c4b77e6d…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 14:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59bd2831f6e4f56b05c12e70b71531a2 SHA-1: 6425018c4554e544fbd0e001262c7ae79db5d079 SHA-256: 28205935c4b77e6dfb7986c85dca83d4ab35bd57e6bfb7a2d671282a3813841e
186 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 poisoning tactic. The embedded URL 'https://soxebez.ru/wb?keyword=bash%20script%20loop%20json%20array' indicates a lure to a search result page. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/wb?keyword=bash%20script%20loop%20json%20array PDF link annotation
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/foxulabivap_nejekenatabosep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5ffdb7d16d79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_602fd0279e334.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/sudewav.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/vopuvofeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_602240f59b1c0.pdfIn PDF document text
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/nezixubofaf.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/17beb7e17.pdfIn PDF document text
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/dapoj.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/cgNhaia/modern_sectional_sofa_with_chaise.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/kuxabur-xotida.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/gijidolubuvo.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/junabetujurufaf_piwiborumuzu_wobozofev_xijukereji.pdfIn PDF document text
    • https://kipidabivipili.weebly.com/uploads/1/3/4/3/134340994/tebufiz.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/musabezi.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/sededapewima.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jgjhiiT/demakobejo.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/jewavomedigalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_6010a331619a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5248 bytes
SHA-256: fb5228895a4adbc3766d9d4bcf68a61c40d96a6fc3cf675bbb07dfbc92fbf573
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 11228 bytes
SHA-256: 5c8533bf1b8a98d82c4dff9bbc659851c67b3bd385fb5d2a864ecf987fe371ad

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