Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a104a9c15aba0ef…

MALICIOUS

PDF

80.3 KB Created: 2021-03-14 23:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 751d7425ecf7b273c813f529cf2f8e4b SHA-1: ca0452a8828dcb36ae81bbca730c2c818a1db05c SHA-256: 9a104a9c15aba0eff2fd9dbcb65960ece1ae25644b5fe374a856df729da52962
156 Risk Score

Malware Insights

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

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 0.9996

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 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://jumiwimov.ru/123?utm_term=wonderful+wallpapers+for+desktop+free PDF link annotation
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/c8823.pdfIn PDF document text
    • https://domepapelixubu.weebly.com/uploads/1/3/4/4/134400118/cfd3782f98b.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/f62fec.pdfIn PDF document text
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/wegisetowexu.pdfIn PDF document text
    • http://tewazezila.66ghz.com/how_to_copy_words_on_instagram.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/7821939.pdfIn PDF document text
    • http://wozonos.22web.org/tubemate_video_er_app_for_iphone.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/b59714a.pdfIn PDF document text
    • https://wazidufadik.weebly.com/uploads/1/3/0/7/130740116/renudafo-liruwir-gijaf-pizadimi.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/5e41a1e8.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/803266.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/kuboki/liwusadoxugavoko.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/pumuwovovubanekad.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/1294350403.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/percy_jackson_demigod_files_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/11142923965.pdfIn PDF document text
    • http://perorudo.epizy.com/where_is_pi_on_ti_30x_iis.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/63982218673.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/centimeter_to_inches_conversion_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/joserebeputizozo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/73008302449.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 5036 bytes
SHA-256: 79e852f0023ea4511febef02c3a65ce840a77331e79a557c9788e3f86ac5b16f
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10776 bytes
SHA-256: 7c79ce9ad51631515858541e7cb74b7c683d28e7d169c03dbe9159519bd33400
font_02_sfnt_off00012545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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