Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd7984f17b11f84…

MALICIOUS

PDF

42.4 KB Created: 2020-03-23 03:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e920a0dac89cbc01ff1278e8070dd0d7 SHA-1: 1e4e0c7d32f7e36a6a8e5e10d931a55f06c54686 SHA-256: bcd7984f17b11f843bbc064f3e9724c5afcc2f2730578f8b644e537a73299097
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body content is largely unreadable binary data, making it difficult to ascertain a more specific attack pattern beyond the link farm. The primary IOCs are the numerous external URLs pointing to other PDF files.

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://twistedboutiquebakery.com/uploads/1/3/0/6/130620902/130620902.html#que+es+posicion+sentado+en+educacion+fisica
    • http://wilarapress.com/uploads/1/3/0/7/130739835/4907989.pdf
    • http://shilohreunion.com/uploads/1/3/0/6/130621839/tebuwa.pdf
    • http://ntkdomains.com/uploads/1/3/0/4/130488241/welabimujitesa.pdf
    • http://carlydairy.com/uploads/1/3/0/7/130738578/dotuzudufozemov.pdf
    • http://782hustle.com/uploads/1/3/0/7/130739214/3476429.pdf
    • http://nnoutt.com/uploads/1/3/0/6/130604947/nesatakujonexane.pdf
    • http://ebexcursions.net/uploads/1/3/0/5/130550854/a8cfa93150221.pdf
    • http://fuckgeese.com/uploads/1/3/0/6/130620857/8146567.pdf
    • http://oaklandpoolcare.com/uploads/1/3/0/6/130604022/db0c978.pdf
    • http://numihomes.com/uploads/1/3/0/2/130288468/fipizetajexipopolob.pdf
    • http://elizabeth-black.com/uploads/1/3/0/9/130969343/ed777fe4193e4.pdf
    • http://lollipoptreequilts.com/uploads/1/3/0/9/130969599/pimisatexuwat_lujutisi.pdf
    • http://autohelpinc.com/uploads/1/3/0/3/130324206/jojoda_zusojejok.pdf
    • http://snorkelkoolina.com/uploads/1/3/0/6/130620459/8c2f68.pdf
    • http://cattywhompus.net/uploads/1/3/0/3/130323477/9e0cf8275fd7e7.pdf
    • http://www.pixiedust-designs.com/uploads/1/3/0/2/130273581/kobevaludasasi_kanumavozefume_dumofaf.pdf
    • http://bookinggolf.com/uploads/1/3/0/5/130551153/kigovovuxubu.pdf
    • http://lifestylesage.com/uploads/1/3/0/3/130379379/d67b63adb.pdf
    • http://www.jakeandadrianna.com/uploads/1/3/0/7/130739746/5521841.pdf
    • http://valstandgroup.com/uploads/1/3/0/7/130775719/vegalitewami-gesijigadediron-wedimegogudaj-tirina.pdf
    • http://www.mindsourcecentre.com/uploads/1/3/0/7/130738875/gitekolug.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_off000079d0.bin
8e9e1c2482525e9b9ba5a67e4df47be75a49262a4222756d7b2d5ce51f1e9995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D0 9088 bytes

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