Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf0be679ccd7593…

MALICIOUS

PDF

82.9 KB Created: 2021-03-28 23:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a6f888e33efa1e485e845d95c341bfc SHA-1: 90a98d11f6ecefc5c6b8dbba1736098184e5df5a SHA-256: ddf0be679ccd7593dceb306adb57d399470a5492ffc98f213925acd88c30c91f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=how+to+make+a+map+using+photoshop PDF link annotation
    • http://pe50off.pro/kwikset_powerbolt_troubleshooting4f2fh.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/21509102998.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/norcold_refrigerator_support.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/vawevuxuworiberi.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/biblia_latinoamericana_1972.pdfIn PDF document text
    • http://effektzhizni.ru/how_much_does_a_software_developer_make_in_india6tbr4.pdfIn PDF document text
    • http://siondez.ru/juwoswn65u.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/1062035.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/7029243605.pdfIn PDF document text
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/3656159.pdfIn PDF document text
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/wumuguwunegaxa-zuninemedeji-monupamupixi-dudafuwobokex.pdfIn PDF document text
    • http://xxlmature.site/kodipedidosadewavuropexyrogn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/tanasefopozeretimiseza.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/anemia_ferropenica_embarazo.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/achievers_a1_teacher_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115eab9f-928e-4ec4-9693-94aa5ce70168/49356597237.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/rabofesosadowidavaramota.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/16926570087.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/how_to_make_circles_around_a_circle_illustrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6684d44a-c8d8-482d-8d17-4d6a3d652f33/84827202951.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/first_person_to_invent_mathematics.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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 5224 bytes
SHA-256: d30974aeca63e0aaf92c25cde4fae2a1d15c94154c4db3027cd464a9b62d1606
font_01_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 10600 bytes
SHA-256: 1971a41e40b1a62b3d4a188dc43ff849251abb0b9c1bd9a354bc73cdd0e39e5e

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