Malicious PDF — malware analysis report

Static analysis result for SHA-256 6233e1c0bc26596d…

MALICIOUS

PDF

41.2 KB Created: 2020-04-02 04:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c072d909a8d57285b958555f5579928 SHA-1: ce14761c568a01722772b479a1a6e2a2b45e30c9 SHA-256: 6233e1c0bc26596d2010a90f1f663f4aa13f0b5b472845e88f27a374c13d593c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files on different domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content or facilitate further compromise.

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://fbiprofilercareer.com/uploads/1/3/0/5/130589286/130589286.html#doing+good+better+sparknotes
    • http://frecklesthehusky.org/uploads/1/3/0/6/130621630/zatixavezan.pdf
    • http://johnnyquidmedia.nl/uploads/1/3/0/6/130604363/genobatogozeperigor.pdf
    • http://eddiecastle.com/uploads/1/3/0/2/130289655/c938a83ed5.pdf
    • http://mixodziezuzywana.pl/uploads/1/3/1/3/131384025/66b7928c.pdf
    • http://hbcualumnination.org/uploads/1/3/0/3/130379804/vokon.pdf
    • http://hornicle.com/uploads/1/3/1/4/131406605/ef39e2d.pdf
    • http://nowhikethis.com/uploads/1/3/0/7/130740211/8133250.pdf
    • http://thaiskypix.com/uploads/1/3/0/2/130274376/bofikepasunezela.pdf
    • http://adamwesteren.com/uploads/1/3/1/0/131070167/sexafibora_naxerubemus.pdf
    • http://melissapellizzari.com/uploads/1/3/1/4/131406582/3312388.pdf
    • http://easternshorechess.com/uploads/1/3/0/7/130776076/fadoxamiz.pdf
    • http://porkahontas.com/uploads/1/3/0/3/130323235/0a0b59.pdf
    • http://marthasmiles.com/uploads/1/3/0/9/130969707/rasote.pdf
    • http://racel.eu/uploads/1/3/1/4/131453027/e21cfa5721e9461.pdf
    • http://rvservicesinc.com/uploads/1/3/0/5/130589135/vexamiti.pdf
    • http://takwenyatourssafarisltd.com/uploads/1/3/0/8/130813554/c5b2c.pdf
    • http://crockettlawyers.com/uploads/1/3/0/7/130738597/3055107.pdf
    • http://gibsonglobaleducation.com/uploads/1/3/0/8/130874498/75111efa6a9e.pdf
    • http://carzonerepairandbody.com/uploads/1/3/1/4/131406344/5a827.pdf
    • http://antitermite-antirodent.com/uploads/1/3/0/5/130544687/jipuso.pdf
    • http://naturalopportunitywellnessarkansas.com/uploads/1/3/0/6/130604621/devisa_tulota_kidose_tuwumezajigaga.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_off0000794e.bin
d050d755f524cb6d7a3c206765aaf5a8c07b97ab00d1e660e6fdd0bf887f0a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 7768 bytes

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