Malicious PDF — malware analysis report

Static analysis result for SHA-256 402d9ccbbd99babf…

MALICIOUS

PDF

60.5 KB Created: 2020-03-30 08:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2876edaea8fec61fa17e39d28fb19dad SHA-1: 6d069b0330ca4d11542e27f1b8e0e6cae02eb110 SHA-256: 402d9ccbbd99babf911e0f4bf59b97f0b3c28b24fda2dcb9041979c4b0406cbf
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to PDF files on various domains. The document body, though partially corrupted, suggests a lure related to 'manejo de residuos solidos hospitalarios peru'. This indicates a likely attempt to direct users to malicious websites for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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://sta-66-99-58-206.ladse.org/uploads/1/3/0/7/130738652/130738652.html#manejo+de+residuos+solidos+hospitalarios+peru
    • http://counselingcollaborativesllc.com/uploads/1/3/0/6/130604589/mipuzexeseseziw.pdf
    • http://wisconsinweddingmusic.com/uploads/1/3/0/6/130621077/3841158.pdf
    • http://fourthworldsystems.com/uploads/1/3/0/5/130540583/8fbe18fb9db34e.pdf
    • http://claritylogistics.com/uploads/1/3/1/4/131410094/zamal-netetezezoxuf-wamepojudini-dusekexawiwal.pdf
    • http://thornwhitt.info/uploads/1/3/1/0/131070674/58cc39c06.pdf
    • http://movingdirectmail.com/uploads/1/3/0/5/130551014/jojoji-dapowefa.pdf
    • http://weirdmystery.com/uploads/1/3/0/6/130622007/latijofavodipobusewe.pdf
    • http://brollopsdekorationer.com/uploads/1/3/0/4/130478975/pisula_wisowotuxodamil_nikegote_rugosebebav.pdf
    • http://milablooms.com/uploads/1/3/0/4/130476412/172233.pdf
    • http://www.erinduffybooks.com/uploads/1/3/0/5/130551166/847091.pdf
    • http://wmsportsreport.com/uploads/1/3/0/3/130313504/5994635.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_off0000c18c.bin
224cc5678e09127681a7ee5b8a05dfa993b4063ac873b2f38cbbbcfb3c5082aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC18C 9292 bytes

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