Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77bd38094c87bb3…

MALICIOUS

PDF

82.3 KB Created: 2021-03-03 01:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 09074dc9f99688d9d1e9dada17da6072 SHA-1: 43aee2d4ccdded9842c4b2c7b3c3a07bc4ec1c79 SHA-256: f77bd38094c87bb3147b944c1eb80ff5e272fe3384fb755f6b50693ce082c3f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing campaign. One prominent URL, 'https://pelibifir.ru/123?utm_term=is+my+ms+license+suspended', directly relates to the document's apparent lure of a suspended Microsoft license. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=is+my+ms+license+suspended PDF link annotation
    • http://abzac.me/8598388791791ec6.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/juxexog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_602265a59e1d3.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/convert_ms_project_gantt_chart_to.pdfIn PDF document text
    • https://juxejiwivila.weebly.com/uploads/1/3/4/7/134713499/8430397.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/herman_miller_aeron_chair_service_manual.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/nozipewolifixexelonaf.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/74f3d5375d3752.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/binupakizexo.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/46550835488.pdfIn PDF document text
    • https://nedatukurugajim.weebly.com/uploads/1/3/6/0/136022322/fovolozuda-jotusowifezi-fumojaja-bodin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/64031428653.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/levixapizuvibimog.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/vokuxutudaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/pan_card_nsdl_online.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/canon_rebel_t5i_details.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/ceeday_sound_effects.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 4644 bytes
SHA-256: 6432d0346082c0e4efcb4b9420e2ade7f515af7716b857a1e3297a5d90b552e8
font_02_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 11196 bytes
SHA-256: 91871f6cc2a0c9ed12ec3b4e234f205548a298c0ed89118d482f0d14584e3e15
font_03_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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