Malicious PDF — malware analysis report

Static analysis result for SHA-256 709ca13c806e1b6a…

MALICIOUS

PDF

137.7 KB Created: 2021-01-27 23:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 41b3abd39ef5f3f516f439bb4a16e337 SHA-1: 95a43cbf0d7d7c157972ddd6070301bec79db56e SHA-256: 709ca13c806e1b6a0507fde22f576740ab373bf1aa0b29525b78a8ea0cc6e3db
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The document body, though partially obfuscated, contains text related to 'Neverwinter nights 2 influence guide' and references wkhtmltopdf, suggesting a lure to a malicious website disguised as a guide. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a link farm designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=neverwinter+nights+2+influence+guide In PDF document text
    • https://cdn.sqhk.co/jowapezo/0KxNoV5/25499358894.pdfIn PDF document text
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/eca1072cc5d146.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/puvubezopesaxigoxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fd1396e31228.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/fipenalibeg_xoguwap_sizapefeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_600de09b5860a.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/1b47c91.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/ia7bf6I/16799330265.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/hijf7Dr/16017806505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465131/normal_5fee4dc1ee0e6.pdfIn PDF document text
    • http://gratoraama.space/gisovuz7dsp2.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/lFhehgv/64028966882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fde56f5a8737.pdfIn PDF document text
    • http://mesretly.xyz/venta_de_recargas_claro_guatemalabtlk7.pdfIn PDF document text
    • https://mutudibekakifu.weebly.com/uploads/1/3/1/3/131398274/7539fee2533.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/afDqgix/59338983276.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/dusined/72817928452.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/autosomal_inheritance.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/billi_ka_song_video.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E14F 5324 bytes
SHA-256: 0ae16cc2afef4521e97dbe84679ddde4da97dabae5b4d049e17e63c8c2a16c50
font_01_sfnt_off0001f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F394 10832 bytes
SHA-256: 2df46a4695536a6f9ed53faabe103a812d92fc61c20ac9a02f98911f23d415d0

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