Malicious PDF — malware analysis report

Static analysis result for SHA-256 011682de0cfacb5d…

MALICIOUS

PDF

67.1 KB Created: 2021-03-08 08:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39870190ced5c2612ea15d93b4365245 SHA-1: e964c3619b37ea732508d173a1b19467a302be48 SHA-256: 011682de0cfacb5dcb53dc9c63e706d920966604727304245ed9a2c202b3cabf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/123?utm_term=verb+form+exercises+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6036e15f612c7.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/fifty_shades_of_gray_filma_24.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/9882609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_5fd0d488ccca5.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/what_is_range_and_xrange_in_python.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/70822f912b659c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6011a98de3256.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/fovawoxutuvigapojizonid.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/jA8hzib/54763097867.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/hYFiiji/wurevidinasazadud.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/what_is_assistant_general_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/qicjijj/19925233292.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/57488212322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6431df7-02b9-4bfa-8694-655c83cdaff1/walmart_grocery_store_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3416b286-0f19-4a41-945b-0871afc44804/ruxori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccef1b8-4443-4d86-84f2-c58f1e580760/pekanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3f6e0e-2918-4fb2-aca5-3a4738b61b96/watchmen_graphic_novel_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b29c42-9440-426d-8e4c-ac57d2146b72/womuzosewisazizopifonul.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/79560155112.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_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 5628 bytes
SHA-256: b86edad900d94fda21b3d85cba34999a017e8664692cb517d4ec75b70c1b9bb7
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10616 bytes
SHA-256: 876ed1db1cb5c8a4e30d153e3e809dd1f66e8b160f0df9ab449dd2cbaa79bee3

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