Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e6bf1155b9389f…

MALICIOUS

PDF

64.4 KB Created: 2020-03-07 19:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 923dbe04f3fe720d26868237147fa376 SHA-1: 41d091813a48c8537d4985ceb0dd174966b380ef SHA-256: 16e6bf1155b9389f8fde6a547d9bcf5f3b9f42edfb218fd0816919ca8b54ced4
96 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 appear to be part of a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted, but the overall structure and link distribution are highly suspicious.

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://74-123-78-173.mgwnet.com/uploads/1/3/0/7/130740193/130740193.html#tratado+de+libre+comercio+mexico+estados+unidos+y+canada+resumen
    • http://unityofstockton.com/uploads/1/3/0/7/130739690/texefewu_bakekoraga.pdf
    • http://bearfruitsbaskets.com/uploads/1/3/0/2/130291523/1141928.pdf
    • http://daycareplayground.com/uploads/1/3/0/7/130738621/2631158.pdf
    • http://unmysterium.com/uploads/1/3/0/7/130776007/ruvomivogitunoronani.pdf
    • http://www.ajoyfulword.com/uploads/1/3/0/7/130740077/5639517.pdf
    • http://porterforcanton.com/uploads/1/3/0/2/130272940/d51576d49.pdf
    • http://support.facialsbyjada.com/uploads/1/3/0/8/130874320/1246963.pdf
    • http://hesterfest.com/uploads/1/3/0/4/130490833/tadixemupof_rilaxemizetuxe_tomogisamukom_sixazi.pdf
    • http://brickerholdings.com/uploads/1/3/0/2/130289508/6558014.pdf
    • http://emiratescabincrew.co.uk/uploads/1/3/0/2/130272295/9195115.pdf
    • http://cuestionentrerriana.com/uploads/1/3/0/4/130476548/tufalofoxanakuwi.pdf
    • http://dcmtobacco.com/uploads/1/3/0/5/130545097/gamekolani.pdf
    • http://quikartist.com/uploads/1/3/0/4/130476229/ea528dc6de878d3.pdf
    • http://stmartinsquare.com/uploads/1/3/0/3/130379287/kobew-widukodiwi.pdf
    • http://poshexecutivetravel.com/uploads/1/3/0/3/130324419/pupopusas-dezupe-zikowugij-vadogozebuneka.pdf
    • http://www.tucsonpressurewashing.net/uploads/1/3/0/4/130436094/zelifu_miwadavufu.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_off0000d03f.bin
3461df6a4eb6f91274d6ea1107a885cd76078f58d081c57e642e3a42ec3c2f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 9448 bytes

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