Malicious PDF — malware analysis report

Static analysis result for SHA-256 245bf56662e7caf9…

MALICIOUS

PDF

104.5 KB Created: 2021-03-11 08:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c9e46041e1d9be176e9b05f7937840df SHA-1: e08d3fcc286f19fa7715ae8702e29c1a3f194ec3 SHA-256: 245bf56662e7caf9ef618745e3c2646c819bc7c2563bfb18cb57957d1978dc40
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=barney+stinson+bro+code+gif PDF link annotation
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/bivasujo.pdfIn PDF document text
    • http://static-get.top/79491065760j0bpb.pdfIn PDF document text
    • http://raifaisentgo.online/pidivubemoman2wv.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/gfaPOjg/baseball_card_collection_binder.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/2f2841.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/bodemevelufelorasas.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/jagez.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/gjH0ieW/lezatoruwafilobomana.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/pjbjdSu/dimuzabajelazodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aacc70dd-9fe4-48a9-a9b4-ad85f6415121/47977524326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9924f82-7b53-4dd8-b6f8-3e8319fab48a/72829114012.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_6c715bcd5403426aa1677e44b10b0d28.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_06c3eba773744df2ab8a560a8640d70b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5733e744-1c06-444c-90f9-81f94bbe71ad/dunkin_donuts_turkey_sausage_egg_and_cheese_croissant_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e54c14-3610-40df-9b5a-c4fe68709751/wonizunuzosabav.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_89741ba149ac475c9d920a286dd73af3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e381a9-aa89-4bcb-aba9-c9c072ff7be0/vomosenujafunabut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab92effc-c7dc-4256-bbc6-ebcb4a8cc6c5/9071451494.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_46f67138f0c74f3789c66a5cff4976d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/744c7da3-b690-445a-afe9-55ef40ad7690/sense_and_sensibility_cast_1981.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_38a3554245a2478f9d947b65164504bf.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 7888 bytes
SHA-256: d14022dcd67af677af5fc694fc7ed6c289626d9f68b163dcbc1c641f62d48468
font_01_sfnt_off00014bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB1 5236 bytes
SHA-256: bc6aab12c1495420ef848fcc97f707c48bcd96a105d77bb24f597c4bb3e8e57d
font_02_sfnt_off00015d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8F 12524 bytes
SHA-256: 9eaee8b2f7348e1f838f6e665875bda550f3acacf25b20af77230058e9da0d90
font_03_sfnt_off00018648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18648 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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