Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aeda8473c822ea5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 09:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 08baf9237bcbb671f5e3bb7e8614f673 SHA-1: 3466e0e0f7888fd5108e1aa456d3ab7be5ab603d SHA-256: 2aeda8473c822ea54482c647259d613bc8d86a550b09aef0585126f822e09320
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to learning Korean and mentions wkhtmltopdf, indicating it was likely generated programmatically to appear as a legitimate resource while hiding malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://leonvi.ru/award?keyword=learn+korean+pdf+online PDF link annotation
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/cecf398b2.pdfIn PDF document text
    • https://fobunimo.weebly.com/uploads/1/3/1/4/131407012/nidutuganeganub_sikazubamufe.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/1802523.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/Rgehf9k/75363883450.pdfIn PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/5380678.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/gdupQif/bawozazovawidabofunirodo.pdfIn PDF document text
    • https://givetowa.weebly.com/uploads/1/3/1/4/131437183/xarufedaroraxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/sjhlKid/hip_hop_pads_free.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/1857121.pdfIn PDF document text
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/1032143.pdfIn PDF document text
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/c46fdca996e3f.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/iVUGIjA/49606212862.pdfIn PDF document text
    • https://tegotaxuwore.weebly.com/uploads/1/3/2/7/132712324/tozojukigini_gabejepuxuxuja_zumajaw_xatojeduduwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/sagusugegife.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_72d9ea8f371345568ee1176e9fcee0ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/19494121321.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/53604286738.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/93160046527.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/miroxopizud.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_715d0979c62e4382a2999ca615c221e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/tamil_to_english_letters.pdfIn 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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 4860 bytes
SHA-256: 0b953c3a9db3dfd38cb9adbcdb454fe40d633e46bb7e21ae01ed3e52eea6ee54
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 11300 bytes
SHA-256: 8573dfb0055ce980dfd5403d6f053767863157db018a8ac9c9d6ceb4b7310479

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