Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6422ed2e0d167b5…

MALICIOUS

PDF

110.0 KB Created: 2021-02-22 21:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3d074a2faf70945f50975788164e2736 SHA-1: 414d42aac061396294aaa01a9fc2535fe783f6cb SHA-256: d6422ed2e0d167b5d8be7e6674bb1fc490993e30c400805dfa24996a6b6cdfd1
134 Risk Score

Malware Insights

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

The PDF contains a large number of external links to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links and the use of disposable hosting suggest a malicious intent to redirect users to potentially harmful content or to engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=surah+yasin+full+text+in+urdu PDF link annotation
    • https://xizenebijebis.weebly.com/uploads/1/3/2/3/132303300/rapafamiveruneb.pdfIn PDF document text
    • http://wavesubikuviv.iblogger.org/bde_full_form_urban_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/GRp8jcY/9038961081.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/dufekitibopupa.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/m0ighaH/xazobujukobemedeso.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/kosogawe-vakivubuxi.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/4948546.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/1618a03dc.pdfIn PDF document text
    • https://zirizimupu.weebly.com/uploads/1/3/4/0/134017553/5134342.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/zavonep-xasapoguna.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/maxezokexowekotavo.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/sogipimitowunen.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/fa0f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/6xhagd9/11744373759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafidifu.rf.gd/dudotokazadoxuzulovol.pdfIn PDF document text
    • http://rulufegelaz.rf.gd/xajiwa.pdfIn PDF document text
    • http://navasegekukuj.epizy.com/anisocoria_en_gatos.pdfIn PDF document text
    • http://butadiviwev.rf.gd/assistive_touch_for_iphone_5.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_off0001757e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757E 5268 bytes
SHA-256: d92c9aa9c939d3b9e872e3808bfe03c67bc577e825a06d160e60521c87431a65
font_01_sfnt_off0001876e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876E 10344 bytes
SHA-256: 6c48785b189e05f62820c0278075d3bd74577988d921e320505f1efa3728d26d

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