Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c5f5d0707e9b76…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 23:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 144d273b735285331276d9a280859408 SHA-1: d7dc270dbe5f6738d4f478a8b8dc1529ef8f6cec SHA-256: 33c5f5d0707e9b76b689980562cf08f856ee8e03ce259ab2380b35ef9d91a765
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=aroma+20-cup+programmable+rice+%2526+grain+cooker+and+multi-cooker+manual PDF link annotation
    • http://weviwoza.22web.org/82338595547.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/tspsc_full_form.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/beyond_belief_josh_hamilton.pdfIn PDF document text
    • https://cdn.sqhk.co/tenerinirik/ijhMigc/i_miss_you_touching_me.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/m1WjcF6/callaway_golf_clubs_sets_left_hand.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/4Hw7thb/rockauto_nissan_frontier.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/peifhjZ/haunted_tunnel_car_wash_near_me.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/softgel_capsules.pdfIn PDF document text
    • http://zinobinipote.22web.org/71855213727.pdfIn PDF document text
    • http://newonesitel.22web.org/apprendre_allemand_livre.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/b6gcgfK/zixupapasupuririd.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/buforumigaseboxixu.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/pipewufujugedarov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_f6d6bddbd23647c9b5529583263104c8.pdf?index=trueIn PDF document text
    • http://bodagoge.epizy.com/bobivefoboxikanarugudelab.pdfIn PDF document text
    • http://kelegelevun.epizy.com/whats_happening_in_disney_in_2021.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_e9454bc01b7b49a983e9535c7f51c0fe.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_2c96c0d45d094e7690b8c2e1848e5d01.pdf?index=trueIn PDF document text
    • http://lidumadinub.epizy.com/labumasufuneke.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_3e11f4dfecb042e785f12f306f926dcd.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_11cfc31e763a40a5b4c69d70b030a64d.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/56559394234.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/155034158.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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 5508 bytes
SHA-256: 698dd22eea4be146d229d49b4ca068fb6302e51cc8b8a97b0dbe0b29d693ad56
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11128 bytes
SHA-256: a683cc8f64f0174590ba01c4d1fc982160d68c53a59cc42dbac046a8c2b755ae

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