Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf166e67f6396066…

MALICIOUS

PDF

81.1 KB Created: 2021-03-22 22:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d371942995e30af53091c281427cd217 SHA-1: caa1d09f14fdfedd97872178dd1583db210ba1db SHA-256: bf166e67f639606623456085c6036cad69eb67a4b0c92f373674e87755331d5c
126 Risk Score

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://xajibur.ru/wix?keyword=formation+of+ions+from+molecules+is+called PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fdfd0e9541a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_602f7a4ad121a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_60261e22f050a.pdfIn PDF document text
    • http://pusokum.66ghz.com/nordyne_furnace_blink_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_60163334b2a3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_0b69153ddd8b4e0797445948e15c5b59.pdf?index=trueIn PDF document text
    • http://jeronegiwok.rf.gd/technika_bluetooth_driver_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5920066e-de08-4406-bc04-d4788c2f5456/45525403639.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/danuvunudotabirezoki.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/buniwubezovimas.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/jepemax.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/flower_border_embroidery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75285a05-e17c-4104-afe2-eb13c02b68b9/what_are_the_different_types_of_drawing_instruments.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/eso_imperial_city_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/excel_macros_tutorial_for_beginners.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_8e81000d058543b7b78bcc5b2d095e5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/how_to_pair_remote_to_hopper_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897d3b91-5b90-4ce8-9c1c-edf0a54ae2e9/silupepuviw.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_21e771a065304927b9b7a15fb8e6fb83.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_425224ccbfd24a59b44304541e8c4fd2.pdf?index=trueIn PDF document text
    • http://pumovumibabir.epizy.com/administracion_de_medicamentos_por_via_parenteral_definicion.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_6e6b1ff0247c4b3fb6f1503187e6765b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 5124 bytes
SHA-256: 741ae0be4b7ccd3b470248642ca43409c650cd6a6649e96b1661e3a614abecec
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 11048 bytes
SHA-256: bd9c45ff9a03f76afe72c403f61b6663242e6c5dc22f6f74b5ce7d663f3ebb42