Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c633b7f7824957…

MALICIOUS

PDF

53.9 KB Created: 2020-04-13 10:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc187e09c06df739f73a7dc6dd07f5da SHA-1: 85715211d30edfea04c9fa48c93c1dc3234f47be SHA-256: c4c633b7f782495727faeb076d41fc3362bd7ebe68220c5dc0e33ca588f68183
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, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO scam. The ML classifier strongly flagged this PDF as malicious. The document body itself is largely unreadable due to encoding issues, but the presence of the URL 'http://inspirationalconsultingexecutivecoaching.com/uploads/1/3/1/1/131163599/131163599.html#cuales+son+los+tipos+de+control+en+el+proceso+administrativo' suggests a lure related to administrative processes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://inspirationalconsultingexecutivecoaching.com/uploads/1/3/1/1/131163599/131163599.html#cuales+son+los+tipos+de+control+en+el+proceso+administrativo
    • http://nbsconsultancy.net/uploads/1/3/0/6/130639745/6936807.pdf
    • http://maluoeco.com/uploads/1/3/0/6/130604205/5018303.pdf
    • http://aardrijkskundeklas.com/uploads/1/3/1/3/131398184/73657d7.pdf
    • http://california-eviction-forms.com/uploads/1/3/0/6/130639810/2448821.pdf
    • http://camelbnb.com/uploads/1/3/0/4/130492038/2980525.pdf
    • http://sporthorsescience.com/uploads/1/3/1/3/131398377/026c3dad6a23962.pdf
    • http://curvycardio.com/uploads/1/3/0/4/130435712/naziwuxose.pdf
    • http://youdirtydawgpdx.com/uploads/1/3/0/7/130775180/zezisegazevoba.pdf
    • http://danzasciamanica.it/uploads/1/3/1/1/131164311/4592390.pdf
    • http://nastasjaneumann.com/uploads/1/3/1/4/131437640/1a8622fad37.pdf
    • http://isaachecker.com/uploads/1/3/0/5/130539247/kuvuzurivo.pdf
    • http://magicalmelody.net/uploads/1/3/0/6/130604014/1cf8993d2d707b.pdf
    • http://fluxevents.co.uk/uploads/1/3/0/6/130621331/jimukevikujezoz.pdf
    • http://photographyinmiami.com/uploads/1/3/0/7/130740391/0455c03f5de.pdf
    • http://houseboat.site/uploads/1/3/0/8/130874381/dalemidufa.pdf
    • http://aardrijkskundeklas.com/uploads/1/3/1/3/131398184
    • 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_off0000a832.bin
6f49339a60512c551392c8e94bd96b2bd2233749ba294bebab25391ddb3a61ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA832 9096 bytes

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