Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb3c61ee51184a…

MALICIOUS

PDF

40.9 KB Created: 2020-03-26 03:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7fa6c80b8552a389e4dabb27c0ccc597 SHA-1: 8c94d7effa0e51ee39016d335e5b393a0bc71d04 SHA-256: 14cb3c61ee51184acec159fae7bd8366c211f597308d18c856f36bec882ee8b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of linked PDF files, potentially for SEO spam or to distribute further malware. No scripts were extracted from this sample.

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://timeframingconsulting.com/uploads/1/3/1/3/131380618/131380618.html#tema+de+oratoria+sobre+el+medio+ambiente
    • http://kevinandhell.com/uploads/1/3/0/7/130776724/7224240.pdf
    • http://equinerxmn.com/uploads/1/3/0/8/130813466/rekatevu-lagonisetaj.pdf
    • http://charityhutchens.com/uploads/1/3/0/5/130543059/nufifibowujalebimoka.pdf
    • http://birkdaleawards.com/uploads/1/3/0/6/130620543/64c23749.pdf
    • http://ofa.sk/uploads/1/3/0/5/130550956/wujudolasaxitag.pdf
    • http://blunderist.com/uploads/1/3/0/7/130739590/rituzajizugadab_savepaweradipa_vipixevali.pdf
    • http://busfayre.net/uploads/1/3/0/4/130435624/goripe-vonowofibumufiv-sigem-robidorobed.pdf
    • http://meskeel.blog/uploads/1/3/0/7/130775169/59c62954.pdf
    • http://japanesepractice.guru/uploads/1/3/0/5/130539059/rigal_funaratijiw.pdf
    • http://libby-hearn.com/uploads/1/3/0/6/130621462/6635912.pdf
    • http://attraversoilbello.com/uploads/1/3/0/4/130491757/303d0.pdf
    • http://samihokkanen.com/uploads/1/3/0/7/130776779/mesipefivupupuraxaz.pdf
    • http://websiteseoshop.com/uploads/1/3/0/2/130289304/8962367.pdf
    • http://cyber-sherpa.com/uploads/1/3/0/6/130621458/e93dc76c.pdf
    • http://eodainc.com/uploads/1/3/0/6/130605346/ligelinafik.pdf
    • http://nieuws.vandaagapple.nl/uploads/1/3/0/9/130969893/32801cc9846.pdf
    • http://ctostevin.com/uploads/1/3/0/7/130739398/6b36c.pdf
    • http://kellyhunt.net/uploads/1/3/0/5/130543276/7481924.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_off000074a4.bin
44443288f10ad1abb8cbcc0e24cd73d07c707e663a5edb7ce45381d5733b2eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A4 8872 bytes

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