Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d46a6838e1cb416…

MALICIOUS

PDF

71.0 KB Created: 2021-03-31 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8e1a9796ca3a67805bdcf24f3ae439b6 SHA-1: 525d437074ebf1315dd235d2d720ade19b561b2a SHA-256: 2d46a6838e1cb416526cb6ce4f931c7a12a4993a9d0dcf6203c2c00360bdeebe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or content distribution tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=banach+steinhaus+theorem+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ffebff2cb966.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/battle_of_khandaq_in_urdu.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/7146045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fc7e36ae9b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5ffb0aca85523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_6001b8cebc569.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/basic_concepts_of_physics_book.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/poxolumuresimu_seposer_zedilajefu_bejevujufaro.pdfIn PDF document text
    • http://kidobujugi.mypressonline.com/belonasuwilavufufil.pdfIn PDF document text
    • http://sizerasadaxer.mywebcommunity.org/aesthetic_value_of_biodiversity.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/bryant_plus_90i_error_code_32.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/viwaxiwago.pdfIn PDF document text
    • http://revinulamuxawa.22web.org/27701345525.pdfIn PDF document text
    • http://dufazesiz.mywebcommunity.org/43064713453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemenugedo.epizy.com/rododufo.pdfIn PDF document text
    • http://sumafalonedap.rf.gd/21612091627.pdfIn PDF document text
    • http://rapevuf.epizy.com/angular_6_admin_template_free_github.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/83421843798.pdfIn PDF document text
    • http://juvojifexuf.epizy.com/asia_spinal_assessment.pdfIn PDF document text
    • http://datidogebe.epizy.com/luvad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 5412 bytes
SHA-256: 8dad8e88656adb902eeec5f610962e57d82f187af76e98ca00b14827469c184d
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 10064 bytes
SHA-256: b2fc1ef99f67db2a2ed5eaa0d7d4fd56dd3f8651693bd86540ed1cbfbe46422f
font_02_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16144 bytes
SHA-256: 25dc1b7d69cb91644f28a5d849e004c6f464f5b7ca2df743cc20f0bbd1bcfc9f

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