Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f6bee3c3ed389…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 15:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd95f0db6d9af43b629bb5f42c6f3758 SHA-1: 6f40eb0cff31aeb6050f8953a880234af66de3ae SHA-256: 0f4f6bee3c3ed389c1a0824a669a595de381e1dd8073c40c2127c77f2ea3c4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=escape+mod+apk PDF link annotation
    • https://dodatnojamstvo.com/userfiles/file/80662415888.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050451296397.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895fe10b3b---89111325116.pdfIn PDF document text
    • https://mmtours.si/uploads/10438405737.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/vukolafolokituxu.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/bumelemepogefadoposune.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/kaxebowe.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/76378581765.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/sibaf.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pokipotamofagewogodixun.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jodeganevowewima.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/78328685699.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/xawaxegimom.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/47959041012.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/fazifafajirumod.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/36293797308.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dofagatuf.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/milakefedorotal.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/67566044916.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/rozurepenawabomuseni.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903222741748.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/zawaruwakizola.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/jepokifizikuxixabewimavo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ccbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCCBF 17316 bytes
SHA-256: c8a93f2ea062280ff7728f9a35006ca0cc7fac225bcc07297df56305a43cfce4
font_00_sfnt_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 15712 bytes
SHA-256: a5f3de1a229f4b100acf77ff418c6cc6dc75c1a6bf805148f7a8679bd405a896
font_03_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 10312 bytes
SHA-256: 7bba8ea80964a715b0e0c9428a8738bd60c689a774c1329ae790116f604d7773

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