Malicious PDF — malware analysis report

Static analysis result for SHA-256 516c7b3ff66c35df…

MALICIOUS

PDF

77.0 KB Created: 2021-05-11 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d822728318e862a1151b039eb3db1f60 SHA-1: b31b474fc682c75dbd1677b2cb027d065e5cce15 SHA-256: 516c7b3ff66c35df85ea929f82b10473251faee39f735ea76ee7827c38e4fa71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the 'epic air fryer cookbook pdf' lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fokemale.ru/strik?utm_term=epic+air+fryer+cookbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460954/normal_606de23daa127.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/mitovitobino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fcbf37f54474.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/43950194627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_606e1d92e0fd3.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/jaxulozixojanugisi.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/xarimara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6037d5d98dd9c.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/biblia_cristiana_completa.pdfIn PDF document text
    • http://afracheat8.xyz/d-link_dir-601_setup_without_cdm6o7n.pdfIn PDF document text
    • http://moneymaya.site/67427254482lelh6.pdfIn PDF document text
    • http://pojoxigi.iblogger.org/bollywood_old_movies_in_bluray.pdfIn PDF document text
    • http://duplicwcnj.space/20883766790zyhnv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_606b708704f78.pdfIn PDF document text
    • http://pro-gram.pro/is_network_security_key_the_same_as_passwordq9cxc.pdfIn PDF document text
    • http://repair-monokoles.ru/52405908621bqge1.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/davawina/how_to_change_honeywell_thermostat_wifi.pdfIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_40450736b9284fb6a43cc98d2e835b55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/peg_perego_prima_pappa_rocker_high_chair_manual.pdfIn PDF document text
    • http://pafisepobisu.rf.gd/tajiwuxemazi.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/dharamsala_cricket_stadium_pitch_report.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/hp_photosmart_2610_scanner_software_download.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_75ee569951e440848000354e13952ec6.pdf?index=trueIn PDF document text
    • http://rosiwik.epizy.com/nepuxob.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/delta_unisaw_34-801.pdfIn PDF document text
    • http://giwamori.rf.gd/6391503734.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_75775ccdc6a345a3867e0f8343932a20.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5200 bytes
SHA-256: aa40d3d880f68f539b26a86aac11775e7231ae7d92592f843ae11292aa9cfcb2
font_01_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 11668 bytes
SHA-256: 90dda84adc79a716d67d7bff6794ccbd955f6394857798ce7befaaebea89d3dc