Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d1270a220afc4e…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 02:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0bc9e71c526d739f14480eb151951431 SHA-1: ed4519bcac4655f8a9677958b571077c9df2edb4 SHA-256: 73d1270a220afc4e6920e5192659b52b789bc40715677e0925d820ea3262207d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a mass of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure itself may contain embedded JavaScript for malicious redirection or exploitation, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+determine+the+text+structure PDF link annotation
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/1085010.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/ee749.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/4123b1d9a29c50.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/nisitebawogu_mevije_xujubo.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/77b58a930a036.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/1962447.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/juxikudag-luwuwo-kukukerogeg-rijito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_36148ec8098b4ceb8a7e2e7c166e0a49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/geometry_transformation_composition_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/the_spectacular_now_2013_full_movie.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_2b05f5c1476447e6bb101b77262891dd.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_3ffd7170e3b946fbb1de990e00c390da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bodajaku/el_diario_de_greg_online_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/compound_cuboid_volume_worksheet.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_fd04df08095e43d4932c459531323453.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_751ebfceb7334f3ca8c75fd97d016aaa.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_03e8358ec7a9472eb0099515484af5d1.pdf?index=trueIn 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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5060 bytes
SHA-256: cc2bf44cc3719cabca4b680b80cf2046fb7fc03245d1163b0037408f51b2ab5d
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 11012 bytes
SHA-256: 8f00db0b927eb2e615a4d39c38b0be7584cd3be7ed99e78e5ba33fca8ff78ab9

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