Malicious PDF — malware analysis report

Static analysis result for SHA-256 00102552e023f224…

MALICIOUS

PDF

116.2 KB Created: 2020-06-16 03:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5de8178175fccc5b5554325f466c494 SHA-1: 725b1fefc533229c881a7a7fa6c7f80b4629bd59 SHA-256: 00102552e023f2247b332384bd2142e1da5d70ac17eed6b0d41fe442f0bae0ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a manual, likely to direct users to malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9028

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://silvatiago.com/uploads/1/3/0/9/130969158/130969158.html#shure+scm820+manual
    • http://hrstrategiesandsolutions.org/uploads/1/3/0/6/130620665/zadosamakezadin.pdf
    • http://acl-company.com/uploads/1/3/1/4/131414743/pidajirenoz-punumov-mulifonikisoru-tavobifujeramox.pdf
    • http://magicpapel.com/uploads/1/3/0/7/130739210/mopebofodoki.pdf
    • http://embodiworksgolden.com/uploads/1/3/1/6/131637276/jevazejudojid_wizagelupoj.pdf
    • http://vixennaillacquer.com/uploads/1/3/0/8/130814122/denimas.pdf
    • http://quinlaninvestments.com/uploads/1/3/0/2/130287875/a112944009d18c8.pdf
    • http://jrdfittedkitchensandwardrobes.uk/uploads/1/3/2/3/132302970/sitikib_sopexigiberusog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017789.bin
40a4a68e56deadccb11445a2e006e1b213cf90f76763e2b6ec87766f8c67dd04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17789 3628 bytes
font_01_sfnt_off00018341.bin
687988933c772685e26e9dfe6f92e5e72f9e248b51625ba172c48489706cfa1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18341 11772 bytes
font_02_sfnt_off0001ab97.bin
9e23c6324263922f3729f7ac1c2567d838f51030baded1bdb8a1e1048cb06ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB97 18056 bytes

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