Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d78dac8978af408…

MALICIOUS

PDF

70.7 KB Created: 2021-02-11 20:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d10da01caca1eb0bfd67068e7e091a5c SHA-1: d4ec4e55ce853df0b579d73e52b169d62d6aefab SHA-256: 6d78dac8978af408d346ea20157d1fbefe25a1f6b5b107c80eec1cca30cf0d87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating the PDF is designed to redirect users to external sites.

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://bologen.ru/wix?keyword=molecular+genetics+unit+test+answers PDF link annotation
    • http://gareduli.22web.org/allan_kardec_biografia.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/pevinoxitemeri.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/itIuljj/gurosa.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/fLrjbic/29739496680.pdfIn PDF document text
    • http://dutuvowori.22web.org/writing_task_2_on_environment_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/hjfgisV/waturaduwiz.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/Ijeifxw/my_cloud_home_setup_windows.pdfIn PDF document text
    • http://moreprodukti.com/run_2020_official_trailer_hboxhcyx.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/bjfhejc/96777024961.pdfIn PDF document text
    • http://klokisik.space/bimibaluvudilt909t.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/bubalulolos-vasovo-jurabeso.pdfIn PDF document text
    • http://digitalmicroteter.xyz/volowup9j25u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biguvuxurezuto.epizy.com/83280739976.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/transformers_rescue_bots_chief_charlie_burns.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/anarkali_film_video_song.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/vatabotorugumoferedewiku.pdfIn PDF document text
    • http://luderaguzafa.epizy.com/60014438849.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/vavolimupaderikifegota.pdfIn PDF document text
    • http://kesurodijafezup.rf.gd/lawerituduxaguvijivib.pdfIn PDF document text
    • http://pomukipokap.epizy.com/5376975025.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 5064 bytes
SHA-256: 32c2a9528f2baa3cb1008f14d6cb84c5f5bee60456aee02c4986c0da787d8dbb
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 10112 bytes
SHA-256: 22a384b0fe469cf27e1ebde67d7e7dea7385eb8fd65c779111a23ac52b1b2cf1

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