Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e8e3dadf9970cb…

MALICIOUS

PDF

52.8 KB Created: 2020-03-09 01:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df4b64db88d32f8341cb6c50800e2a36 SHA-1: 34d108e12b8d140f57be4849ddd79c57b8393ff4 SHA-256: 00e8e3dadf9970cba3ca9c8007066d7a82728d4f39d25630052c1b6715290a27
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to PDF files hosted on unrelated domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm or SEO spam tactic. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://wcd-4k4esn.mgh-r.ch/uploads/1/3/0/6/130620626/130620626.html#drug+induced+aplastic+anemia+slideshare
    • http://code-bill.com/uploads/1/3/0/7/130776113/3127f4f3.pdf
    • http://ricks1946.com/uploads/1/3/0/3/130379379/vuxudewapiwexoni.pdf
    • http://beefedupbarbecue.com.au/uploads/1/3/0/9/130969971/5406600.pdf
    • http://miekebreukelen.com/uploads/1/3/0/2/130288522/jinadifoze.pdf
    • http://www.ensg360.com/uploads/1/3/0/5/130588548/10f6c489d4b.pdf
    • http://stalvanmourik.com/uploads/1/3/0/4/130488198/fffb83f.pdf
    • http://earthangelgear.com/uploads/1/3/0/4/130435667/tumasupifav.pdf
    • http://bestboardshops.com/uploads/1/3/0/4/130483895/952778.pdf
    • http://dalesidea.com/uploads/1/3/0/3/130313826/e50ba0e1b1e42.pdf
    • http://www.gymprotathlitis.com/uploads/1/3/0/6/130621031/pogizorure-lagutasenox-soxateg-ranobixed.pdf
    • http://lt-wellness.com/uploads/1/3/0/5/130539450/3462010.pdf
    • http://cambcollege.com/uploads/1/3/0/6/130605255/fiwiwefezaripek.pdf
    • http://modelamics.com/uploads/1/3/0/4/130477310/zamuvuzikax-pilolojibu-fepanovefi.pdf
    • http://www.melotot.net/uploads/1/3/0/7/130775985/84f8803ba.pdf
    • http://www.kidsncoffeeeire.com/uploads/1/3/0/5/130539446/naxufibireze.pdf
    • http://scahistoricalsociety.com/uploads/1/3/0/5/130551795/tegowupisamija.pdf
    • http://jubileehomeinspection.com/uploads/1/3/0/6/130604692/bevagenekakax-kexanozola-febemimezika-monuvaned.pdf
    • http://baijialepingtai.f18.ebkf.org/uploads/1/3/0/6/130621622/vokomabesu-xuvitud-narogedababafe.pdf
    • http://infinitebydesign.org/uploads/1/3/0/2/130289563/cd72e1486a16e.pdf
    • http://nwm1.club/uploads/1/3/0/6/130620437/83662f10319224.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_off0000a54e.bin
0fd584e088c472cf462f73ce4fc0a2264a471600038bbe7472bd8a4251fe7e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA54E 8336 bytes

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