Malicious PDF — malware analysis report

Static analysis result for SHA-256 e266d57c0c205752…

MALICIOUS

PDF

74.0 KB Created: 2021-03-16 23:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cfc60eff8854ae19836b2e846384ac87 SHA-1: d55f61d048e5321b7d9843e02ab69134091c385a SHA-256: e266d57c0c2057521f3d185f3f2fa47365eb3fdc1a4e5fb1064ed2905a88ac7f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to disposable hosting, indicative of a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded URLs and the PDF structure itself are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=civics+unit+1+study+guide+citizenship+and+the+history+of+the+united+states PDF link annotation
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/pojonu-nejomekul.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/6xykwjd/funny_ringtones_for_bts.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/0c52182c4.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/cijhejc/24496287113.pdfIn PDF document text
    • https://xujifedivo.weebly.com/uploads/1/3/4/8/134862591/zafurunadop.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/jhieYif/modern_sofa_bed_queen.pdfIn PDF document text
    • http://bumefivaloso.scienceontheweb.net/arcswat_manual.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/69298349404.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/zejizafujizusev.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/71917616270.pdfIn PDF document text
    • https://pomudimukiribob.weebly.com/uploads/1/3/5/3/135313003/5340717.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/symphonie_fantastique_5th_movement_analysis.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/tilekup-zalubixoxun-zajok.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/b8594ee9-4f05-488d-af4d-cb27e0e5c6ad/69211908443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0fe77f-9e6e-435b-aa97-6a77b4ed5fd8/talk_english_online_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5280e4-0bed-4af2-adac-821142f12d9d/fijifavuwusikape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495dd6a6-75e3-4ef2-9147-d96931de127e/34456824786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f115b923-63bd-4a68-b2b4-797c8f638545/13373373319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bf70eb-5eeb-444e-ac5d-a3879936334a/powizuxotaluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2368e540-055a-4034-8af2-27c576b584b1/windows_7_torrent_tpb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f3245a-d2b4-41cb-a30d-b982e31223a0/kiwobonidilikewimuzurofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d2e8f7-662c-4937-96a2-6792ce806068/dugar.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5556 bytes
SHA-256: d132706ed1fec2851b7daa546519af6280461a47b15866a24aaa608e51238587
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10580 bytes
SHA-256: 68f9d8fbdff7a32ab9595faa1c50994901188f05c353f47b2f23c2fee2ad09fd