Malicious PDF — malware analysis report

Static analysis result for SHA-256 82daa89ba3057d1b…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 23:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3333202fef4ac4186991dfaeefd484e1 SHA-1: d7307f0ecc9eb111803f30c68d11dbd5a8797c96 SHA-256: 82daa89ba3057d1b204333e0d3cb90a09c17b790ed84005bdf50c273ec71f1c0
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, suggesting a lure to trick users into visiting these sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=soil+nematodes+pdf In PDF document text
    • http://hardcreditcheck.info/paluxegulujofuvalavazet0tvas.pdfIn PDF document text
    • https://rofewonopanofav.weebly.com/uploads/1/3/5/3/135312507/nusumowoxe.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/zikepusoj.pdfIn PDF document text
    • http://bella24.xyz/database_system_concepts_sixth_edition2z275.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/7783434.pdfIn PDF document text
    • https://guxatizozekeme.weebly.com/uploads/1/3/4/7/134733227/xepipabumogonet_navoxotara_lekoj_larabub.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/teladokux_filulimagun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_0ad9700595834dbd91abd67c71d80ef1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/nobovumese.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/kunono.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_e739b58f3967486c9a6d0c7a535b4205.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/shapes_worksheets_for_grade_r.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/80168702461.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_b4d8760ce1b6485ca04973a8dc2d8df1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee938d03-383d-4bf2-afa0-b0e2c2331a15/66546693930.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/vodaledujemijunimum.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9d1d12a68d094db3af6039a64a7b5bd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e180c01-c157-429c-8ddf-de59da276f0f/64988965575.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/88084423929.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5192 bytes
SHA-256: 87757a7f83324db865e0a4f8e91ba0e5bcb2e44c755f2220154dae541d065a8e
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10248 bytes
SHA-256: cf7e20988b3ff31ebd22a296b0f6b0e24fec15d7ba94a6d152a61626693ddd69

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