Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75731f288be7758…

MALICIOUS

PDF

74.2 KB Created: 2021-05-07 04:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d7d84d8bd434400a36094b7332e12aa9 SHA-1: 5a42ea02ebcb5e89d592201a088ed3cbe8715868 SHA-256: c75731f288be77586752720d51d4ec5dc767dcfbe981bb98868af606bbae58eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://golowaki.ru/strik?utm_term=how+to+install+linksys+re1000+without+cd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5ff31b965975c.pdfIn PDF document text
    • http://petrol-v-pol-price.site/rangkuman_materi_usbn_biologi_sma_205qb9l.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/brastemp_inverse_manual.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/business_agreement_sample.pdfIn PDF document text
    • http://kataeta.club/nanostation_m2_ap_setup323yh.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jie3dgc/84973633135.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/ggifyhg/backhanded_compliments_funny.pdfIn PDF document text
    • http://lixusopo.mywebcommunity.org/que_es_afinidad_electronica.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/old_huckleberry_finn_book_value.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_600e418b5a54f.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/gjihhej/77295116475.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/egihj3g/tinelo.pdfIn PDF document text
    • http://korirojasutito.22web.org/agricultural_production_systems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_d4c35c3a4860405789452360259ce3d2.pdf?index=trueIn PDF document text
    • http://naxixexofeveto.epizy.com/photoshop_event_poster_template_free.pdfIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_d28fa726daa74e089e2886a81f78d3eb.pdf?index=trueIn PDF document text
    • http://nakafase.epizy.com/48515913855.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_6c2e153d94044f12b4e2e4cd6f395911.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_9d4b9d5d28a14b80bad02892b104c16c.pdf?index=trueIn PDF document text
    • http://judixipe.epizy.com/talerododaziwaziwepemami.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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 5440 bytes
SHA-256: 6352756a2abffd2c05ebf71f6f5623663fb890f07b5911d8804451562a57cf46
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 11520 bytes
SHA-256: 28147fac66f884a9fc4630cf84af69863758c8ecbcdce676e80001b709c12420

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