Malicious PDF — malware analysis report

Static analysis result for SHA-256 242d3d3ab5f2cc38…

MALICIOUS

PDF

50.6 KB Created: 2020-03-28 02:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 098a2ae1292a0522d97f5a6c08cfa539 SHA-1: ffe356cffeab5c7407c311e580883641c05b9d60 SHA-256: 242d3d3ab5f2cc38bb6bfd698362db1f0653a3382d16bb8e541b73cdea1e9b4b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to the URLs, suggesting they are intentionally embedded to lure users. No scripts were extracted from this sample.

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://merritt4nm.com/uploads/1/3/0/4/130476539/130476539.html#berenice+edgar+allan+poe+analisis+literario
    • http://handsomedogsoapco.store/uploads/1/3/0/7/130776100/muduluziravew_timuvowiwiju_vubojudid_kupibotuje.pdf
    • http://placerexteriors.com/uploads/1/3/0/7/130740440/5957009.pdf
    • http://netcommnc.com/uploads/1/3/0/6/130639273/7853904.pdf
    • http://goodvibespetcare.com/uploads/1/3/0/6/130604312/3895568.pdf
    • http://photosbygayle.info/uploads/1/3/0/5/130551103/1962826.pdf
    • http://bookhostelsdirect.com/uploads/1/3/0/4/130435972/jabatanit_xexonujur.pdf
    • http://anicetomojica.com/uploads/1/3/0/6/130621973/ece549.pdf
    • http://arctictreasures.shop/uploads/1/3/0/4/130488969/fuxepe.pdf
    • http://teachlikeanartist.com/uploads/1/3/0/4/130490719/dijipamudifotugawam.pdf
    • http://allpatiodecor.com/uploads/1/3/0/6/130620759/b05c26e7082c68.pdf
    • http://www.deborahjtaylor.com/uploads/1/3/0/5/130588809/2efc3cd4f2bc.pdf
    • http://www.befriendingcrystals.com/uploads/1/3/0/5/130542934/1698937.pdf
    • http://news.stockmi.com/uploads/1/3/0/6/130639221/pigejubegozox_mezojalegabafow_mixarapazeni_werodutejul.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_off00009dfa.bin
2b7cd06c558df1d73d4962ef0563d056d96f805e72d42e2155aad1e67e065893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFA 8628 bytes

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