Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf164fe28a4b435…

MALICIOUS

PDF

42.4 KB Created: 2020-03-12 12:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d5a6e461437735ec90a7b112b28e5fb SHA-1: f7ad8529df5485dccbc923b8e6fb510ddc28b07d SHA-256: 1bf164fe28a4b4357d47a8523edffbc62f78588e0dd3e0d13ef3dd1cc9cc8877
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to a tutorial and URLs that appear to be part of this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://www.elegantcreations.net/uploads/1/3/0/6/130639669/130639669.html#tutorial+autocad+civil+3d+2015+bahasa+indonesia
    • http://resa5adultbasiceducation.com/uploads/1/3/0/7/130739457/87b8821494bc1d.pdf
    • http://www.caryfamilycounseling.com/uploads/1/3/0/5/130588864/6326297.pdf
    • http://criptohousepanama.com/uploads/1/3/0/6/130639438/rilazorinajow.pdf
    • http://juliancert.com/uploads/1/3/0/6/130604488/71c3a74b.pdf
    • http://naturaphysicaltherapy.com/uploads/1/3/0/5/130552016/8395534.pdf
    • http://goldheartpersians.com/uploads/1/3/0/4/130483741/turigexomu-filupixemodos.pdf
    • http://godsfamilygodsearth.net/uploads/1/3/0/5/130539412/5288084.pdf
    • http://anjaliseries.com/uploads/1/3/0/6/130605135/061218ab.pdf
    • http://thesustainables.net/uploads/1/3/0/6/130620694/f23e7c4e46.pdf
    • http://herebeobjects.org/uploads/1/3/0/6/130639630/regigutinewujof.pdf
    • http://privolicy.com/uploads/1/3/0/5/130588307/345718.pdf
    • http://fishtownshops.com/uploads/1/3/0/6/130639840/5363693.pdf
    • http://www.kintsugihealingarts.com/uploads/1/3/0/7/130739063/4608347.pdf
    • http://www.noscopegaming.net/uploads/1/3/0/7/130738945/noravuzizoru-taxemejexok.pdf
    • http://mywholelifeisshirts.com/uploads/1/3/0/6/130639342/zesinerejifu.pdf
    • http://webdisk.fillogreekbakeshop.com/uploads/1/3/0/7/130738727/buxagikalugij_rupek.pdf
    • http://userinteractiontesting.org/uploads/1/3/0/7/130739530/e06f223433df.pdf
    • http://www.beachcouture.ca/uploads/1/3/0/9/130969264/wevarolovamusez_xorev_foropowovikosot.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c9.bin
8cc5b8af5f514c04ddbaf66a0cf0a14373380c008fe04eb66a3645fd5378367c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C9 7280 bytes
font_01_sfnt_off00009285.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9285 2604 bytes

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