Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcff6bc63e61e03…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 03:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d389f5e729285e5e526fd78b7353811 SHA-1: 55d39bd3df7dd083d24750a84978929192de8fd0 SHA-256: adcff6bc63e61e030a2c9953a939a5abaf6edb0b8aa422020d3eed315ee64505
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 0.9998

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://midufefew.ru/wix?keyword=jacked+up+chevys PDF link annotation
    • http://velavedi.iblogger.org/avisos_de_ocasion_clasificados_el_informador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_6035cd2ad66fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff6845ea2851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_600519f77ab8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_60477dd7e2008.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/normal_hematopoiesis.pdfIn PDF document text
    • http://govovimifakine.mywebcommunity.org/janusz_siuda_gramatyka_angielska_dla_pocztkujcych_chomikuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6052504710bbe.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/division_decimal_by_whole_number_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5fdab2e97f173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_6036978540aa7.pdfIn PDF document text
    • http://gonakasuzoze.22web.org/how_to_read_electrical_circuit_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_601d91513368d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juruzimezez.rf.gd/hssc_clerk_answer_key_21_sep_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/natural_photos_hd_full_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/paxapepagarijave.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/13159793803.pdfIn PDF document text
    • http://wekameti.rf.gd/cycle_se_aaya_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/vopugobevuvivelilixazimak.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_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 5248 bytes
SHA-256: 229058effe7dd89970b4ab9c83e44f6eb41d8cf9b6c3989ecfb2aa337f688347
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 11448 bytes
SHA-256: 917ae33340b661d4bc4ed1d3972025d2b3c2d9918882f617b0ed92b38659d60a

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