Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0c2d341f569092…

MALICIOUS

PDF

95.0 KB Created: 2021-04-15 04:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c81845ae44f6ed13e7fd6072e02f0d3 SHA-1: a5dca635bb35441f184146331b51b7993c63ca51 SHA-256: 9f0c2d341f569092a6d009bd75754868d4a8f0c9b5fc345fa32fb56911d3d861
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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 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://bologen.ru/strik?utm_term=84+charing+cross+road+film+online
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/tadoradosirat-dizoxej.pdf
    • http://apkweb.net/637711782953dr3j.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/sojefe-gurenuti-rijikoveperuk.pdf
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/4939304.pdf
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/6223063.pdf
    • http://epaytds.xyz/foxojupanenyscjf.pdf
    • http://zaliv2k20wowowowoow.xyz/wuvunivek6l.pdf
    • http://hookup671.site/52458135059n49ev.pdf
    • https://cdn.sqhk.co/vodadavubex/hmq2hc3/futezamodige.pdf
    • https://cdn.sqhk.co/bupewazadufa/9TgjmOi/bozima.pdf
    • https://vokaratux.weebly.com/uploads/1/3/5/3/135335958/bizoxewofetego-bomubi.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nomikidavex.rf.gd/libro_bls_espaol.pdf
    • http://peluxatem.epizy.com/im_westen_nichts_neues_film_1979_trailer.pdf
    • http://jaforafonox.rf.gd/defegozevepipowudabep.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_d6aa5a7bf5b94f33996e343c08b12cdb.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_82b9719912654cde93e8cd67f3300940.pdf?index=true
    • http://vupikefugogulup.epizy.com/how_to_apply_for_hope_scholarship_in_georgia.pdf
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_ddf51ee4be50446eb5f767a48eeda142.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_a3a4528fc07a488aa51a532988d0d511.pdf?index=true
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_a1f53511340d4fe1ac2e711dbaa46e9d.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_36ee706a31dd436e9978b6deab2c17c8.pdf?index=true
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_bcc85cf7380540509ba15c26e95241de.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013277.bin
9d89a4afc3b9887d87bc710fa041a891ca3b3a1e48e12edcef0d18db863472a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 5620 bytes
font_01_sfnt_off00014572.bin
bac3ca2e041d2050179ac9c2679474f38314629a48b3d09c1bba2b5b2b773a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 12504 bytes

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