Malicious PDF — malware analysis report

Static analysis result for SHA-256 01594d64bbe54601…

MALICIOUS

PDF

64.1 KB Created: 2020-03-27 11:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9b3b6fb9061713df4ca81e794df4fdef SHA-1: cdd4f24890e8fb5516de4ae051fb6b26674dd9b1 SHA-256: 01594d64bbe54601ac280a4235dab479cdb6d464bf056238214713298986c1c6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDFs with numeric slugs, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, includes a reference to a crime novel and a URL that is also present in the heuristics, suggesting a lure to encourage users to click on these links. The ML classifier strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kahauling.com/uploads/1/3/0/6/130639417/130639417.html#where+to+find+hosea+another+crime+novel
    • http://ottica2g.com/uploads/1/3/0/6/130605248/7958713.pdf
    • http://www.loren-brown.com/uploads/1/3/0/4/130483279/xupidogetodasexus.pdf
    • http://bluelagoonbeauty.com/uploads/1/3/0/4/130483163/e06325c9b2656b.pdf
    • http://scheduleashoot.com/uploads/1/3/0/7/130776159/256600.pdf
    • http://www.blackbirddesigns.net/uploads/1/3/0/7/130739596/c9b0c.pdf
    • http://cahabagrand.com/uploads/1/3/0/3/130379285/nokijozimoxixudafaj.pdf
    • http://healinggenerationsneurofeedback.com/uploads/1/3/1/3/131384169/3915284.pdf
    • http://ccpcoastalbend.org/uploads/1/3/0/4/130436473/podopiwizibovoresof.pdf
    • http://thereccenterweekly.com/uploads/1/3/0/3/130379589/591a14fe.pdf
    • http://pelicanpas.com/uploads/1/3/0/7/130776787/jefazujojabux_voguzupofu.pdf
    • http://uglyfoodisbeautiful.com/uploads/1/3/0/5/130543538/kusudaxizowojatoj.pdf
    • http://flowfood4health.com/uploads/1/3/0/7/130739347/matuduz-kikigezagawejim-nafidexadif-gezoziguletofur.pdf
    • http://hotzonefishingcharters.com/uploads/1/3/0/5/130539340/xubojewidu-mirelejar-tapamoto.pdf
    • http://numinersfootball.com/uploads/1/3/0/6/130639222/5bb1d8e.pdf
    • http://www.helpingheartsli.com/uploads/1/3/0/5/130544385/9235998.pdf
    • http://upholsterysewingmachine.net/uploads/1/3/0/6/130621127/mifitajimirozov.pdf
    • http://www.life2art.shop/uploads/1/3/0/4/130483191/kifazesab.pdf
    • http://my-auto-max.com/uploads/1/3/0/4/130476277/2931331.pdf
    • http://eaglerockjuice.com/uploads/1/3/0/3/130323620/4974957.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_off0000d46c.bin
e58d0f54e9b1a6affaa1bb212b4fd46d53ae3e123896a23ab9299dd5dbb3274f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 7692 bytes

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