Malicious PDF — malware analysis report

Static analysis result for SHA-256 8451e5196f44de8a…

MALICIOUS

PDF

38.3 KB Created: 2020-03-29 07:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 0a019cb057268767b87eb5d7125eae8c SHA-1: eecbbefcfe156ad353cf37a5d1bec0162dea26b9 SHA-256: 8451e5196f44de8a64b39c6ad059305f13dfe371a1c34b2238934c7fc5c85355
104 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 point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The primary URL, http://74-123-72-53.mgwnet.com/uploads/1/3/1/4/131438461/131438461.html#excel+conditional+formatting+second+highest+value, likely serves as the initial lure to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://74-123-72-53.mgwnet.com/uploads/1/3/1/4/131438461/131438461.html#excel+conditional+formatting+second+highest+value PDF link annotation
    • http://freecourts.com/uploads/1/3/0/7/130775751/lexivaloxi_piguwaluzu.pdfIn PDF document text
    • http://vegactive.com/uploads/1/3/0/7/130775431/jigibuziz.pdfIn PDF document text
    • http://autodiscover.getbjs.com/uploads/1/3/0/5/130543158/65b998c1d93.pdfIn PDF document text
    • http://www.luxav.co.uk/uploads/1/3/0/5/130588545/9315369.pdfIn PDF document text
    • http://mustangremediation.com/uploads/1/3/0/8/130874130/fiwus.pdfIn PDF document text
    • http://centralrefrigerationinc.us/uploads/1/3/0/7/130738955/b39a3.pdfIn PDF document text
    • http://baselabstudios.com/uploads/1/3/0/6/130620626/07869.pdfIn PDF document text
    • http://trejoconstruction1954.com/uploads/1/3/0/6/130620603/banigifi_bapilufekoxe_wogebovu.pdfIn PDF document text
    • http://sgiindia.us/uploads/1/3/0/9/130969204/tonelipexuz_sezusir.pdfIn PDF document text
    • http://muhammadsrsabry.us/uploads/1/3/0/2/130270898/3037862.pdfIn PDF document text
    • http://eco-plantravellight.net/uploads/1/3/0/4/130476579/8d01b1b4.pdfIn PDF document text
    • http://janetiques.net/uploads/1/3/0/2/130270997/nigovutuxuzovifebimu.pdfIn PDF document text
    • http://candyrodriguez.com/uploads/1/3/0/8/130874398/9fe2207f7.pdfIn PDF document text
    • http://www.advbrand.com/uploads/1/3/0/6/130620154/rimonujuno_wunubos_feniz.pdfIn PDF document text
    • http://allan69.com/uploads/1/3/0/7/130775002/4255758.pdfIn PDF document text
    • http://www.lysandertreumann.com/uploads/1/3/0/6/130621940/nolafenaxakubomaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 7896 bytes
SHA-256: 2673444a25b99dfe8f9d47036d141e13cb6223a0d3326f70d07129f2536ee933

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