Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f9663ab9ae1387…

MALICIOUS

PDF

76.8 KB Created: 2021-03-11 09:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06efe9373a800eb784731d69a36554c0 SHA-1: 1513a8c670e7b5c90841307576ee913f236b5dec SHA-256: 74f9663ab9ae1387f4ee240fa0d67d0b251db159820b8f2efcdfa06d3cf37361
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the embedded URLs suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=pearson+btec+applied+science+level+3+pdf PDF link annotation
    • http://silkhfig.bid/325502938746mt6p.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/osmosis_biology.pdfIn PDF document text
    • http://hookup673.site/starbucks_beverages_sizesob7wr.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/e2jfnWV/refez.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/appositive_phrase.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/jivetar.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/tc_electronic_flashback_2_instructions.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/9362807.pdfIn PDF document text
    • http://zebrait.fun/zuduwokilosixunawobubeq0nbk.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/iceFwdK/sticker_maker_studio_for_whatsapp.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/starbucks_barista_hourly_pay_texas.pdfIn PDF document text
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/5e114ffc.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/a6daaff0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupagiji.epizy.com/botoxelupobidovegasubuduw.pdfIn PDF document text
    • http://kiwuvapinemugi.rf.gd/mutijoremano.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/chief_eval_midterm_bullets.pdfIn PDF document text
    • http://xulifaxamozis.epizy.com/77623487167.pdfIn PDF document text
    • http://gekojiguno.epizy.com/can_f_statistic_be_0.pdfIn PDF document text
    • http://nexofemexer.epizy.com/nejupivozuxepofupux.pdfIn PDF document text
    • http://kinadawefenipe.rf.gd/guxebiridovalorisabota.pdfIn PDF document text
    • http://rovatidakenaj.rf.gd/cornell_notes_sheet.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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 5512 bytes
SHA-256: 3a03507758485c67abdee7009c850759087b8a513eca15aa7b6918647b29a394
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10824 bytes
SHA-256: 0cf5b7df01169bbdd9edd517db2c17a7032e5ecca8f76830e89332eeb022d39a

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