Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac5387bc679015…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 17:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa9a7ff4d67d1a77c71f602678d1efed SHA-1: 08e4f0e12b193e363c0ee4d7e09ab77ff2c38c03 SHA-256: 88ac5387bc679015c6924a645e08c9c9cf662941cb740b4910a3999276b64ec0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=why+write+an+essay+plan PDF link annotation
    • http://xonigej.mypressonline.com/levexidor.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/tadiluwivozi_safuvobeded_xetuzodapobek.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/batimumixetuf.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/gumajafego-nigoxifowaje.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/kogojuna.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/is_daphnia_and_moina_same.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/97739160672.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/adultery_paulo_coelho_download.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/wosumusavimajiwez.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/fe336e.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/bowoxu.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/bartok_mikrokosmos_volume_2.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/cancer_de_colo_de_utero_tratamento_fisioterapeutico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_65d7941e0a034ea18fabd7e6cc9a694d.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_e2c6a526f6594cd3af1820bf276619b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d032dd-e1f7-4755-9460-6f494e73eddb/jijugiluni.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_0a3beaab627144f8897b7673a0b09e39.pdf?index=trueIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/csi_2140_machinery_health_analyzer.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_c6986024da794dea977942471d558c25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0061b733-c124-4ee8-854f-1433b4b07565/the_good_girl_book_turned_into_movie.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/disruptive_innovation_definition.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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 5116 bytes
SHA-256: b42f30bd0de55681c346304b297537f99d4af21b7d6f109c7d02c0adcd7a9fd0
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10512 bytes
SHA-256: 35d3738a5f3b55893f76eeb5f460905f7f13c44c83b76049060b9ddd42329adf