Malicious PDF — malware analysis report

Static analysis result for SHA-256 644a2cc927986049…

MALICIOUS

PDF

35.7 KB Created: 2020-06-08 19:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56869e363becfc5c11603891fa9ce249 SHA-1: 2ea78d2c89f27e53898cb67fb84cae40651943d7 SHA-256: 644a2cc927986049c5754eb38461fc9a9b8df63f8589a7ba4adbb9c5581daed5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it's a dropper. It contains numerous external links, suggesting a link farm or redirection mechanism to distribute further payloads. The embedded URLs point to suspicious domains, likely serving as part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8739499-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8739499-0
  • 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 http://74-123-73-112.mgwnet.com/uploads/1/3/0/5/130538918/130538918.html#les+valeurs+du+pr%25C3%25A9sent+pdf
    • http://leadingrecords.com/uploads/1/3/0/5/130545493/1064595.pdf
    • http://swamptraps.com/uploads/1/3/1/4/131453542/tiximijofisolodovi.pdf
    • http://74-123-76-3.mgwnet.com/uploads/1/3/1/6/131606087/zusuwu-ditulupiv-pofozeru-wobesopasipeb.pdf
    • http://streettreat.net/uploads/1/3/0/6/130621460/dofijesafe.pdf
    • http://mailx.ambroseco.com/uploads/1/3/0/7/130775052/2472297.pdf
    • http://fullcircleathlete.com/uploads/1/3/1/3/131379402/fulidazokuku.pdf
    • http://sautterfarm4.org/uploads/1/3/0/8/130813988/7382635.pdf
    • http://maryannfletcher.com/uploads/1/3/0/6/130603977/faladim.pdf
    • http://heroinesclub.com/uploads/1/3/0/7/130775539/8c50494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://botitovut.files.wordpress.com/2020/06/xetodad.pdf
    • https://roxesep408050129.files.wordpress.com/2020/06/34693865357.pdf
    • https://zamopolowi.files.wordpress.com/2020/06/66401006941.pdf
    • https://sudevoxe.files.wordpress.com/2020/06/delusumiv.pdf
    • https://kemetax.files.wordpress.com/2020/06/gunaguxomubuxebuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e28.bin
17d7adac0e1cacb20c6623355f4ab22508389557fd54e81bdbb131fd9dd88c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 10996 bytes

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