Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3492b97881304f8…

MALICIOUS

PDF

35.0 KB Created: 2020-03-25 04:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c94d798fc01240634e8a5b4dd30c456b SHA-1: 2a76d3c1f6e3a0f90d45f7bf49edad0d8df9ad7d SHA-256: d3492b97881304f8fda3beaaddf123b6a9c4262890a4b97b0d8df4beb6690f75
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, containing a large number of external URLs pointing to various domains. This technique is often used to manipulate search engine rankings or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports this assessment. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://ebssolarelectricandair.com/uploads/1/3/0/4/130435710/130435710.html#hoover+floormate+fh40160
    • http://www.bhblankenship.com/uploads/1/3/0/4/130483546/171323b5d4f2c5.pdf
    • http://www.bodiibyjayy.com/uploads/1/3/0/4/130435631/napig.pdf
    • http://redcreekcold.com/uploads/1/3/0/7/130738919/2767482.pdf
    • http://dawnhomesut.com/uploads/1/3/0/5/130545189/0102de.pdf
    • http://rosavoice.com/uploads/1/3/0/8/130874397/5210953.pdf
    • http://stylogentlemensweekend.com/uploads/1/3/0/5/130543945/7468987.pdf
    • http://worldartsantiques.net/uploads/1/3/0/5/130551184/jefilapozinif_buxoxixuf.pdf
    • http://rbuels.net/uploads/1/3/0/6/130639733/14657703bccf93f.pdf
    • http://www.probicon.be/uploads/1/3/0/7/130776316/6902648.pdf
    • http://www.twenty5ive8ight.com/uploads/1/3/0/5/130540065/8579402.pdf
    • http://imaginarylabs.net/uploads/1/3/0/7/130775129/1164490.pdf
    • http://www.dtottisu.com/uploads/1/3/0/4/130483864/pasasuwavapenid.pdf
    • http://lagartosrugby.com/uploads/1/3/0/6/130620970/zinokijebim.pdf
    • http://www.jackbarripp.com/uploads/1/3/0/3/130323581/5119378afe.pdf
    • http://jozscarlet.com/uploads/1/3/0/3/130324044/4382596.pdf
    • http://www.shawnajanikowskicnh.com/uploads/1/3/0/7/130775653/mavasemejot_lexomovepa_labuvujaru_gidudisotosugi.pdf
    • http://webmail.fennoyrittajat.fi/uploads/1/3/0/5/130588529/516b2c.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006318.bin
d92aebdb5528daf8491cb60fc1a82d318206e322d10f8a03e075a2ab065df226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6318 7104 bytes

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