Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87d0553287804d6…

MALICIOUS

PDF

40.0 KB Created: 2020-04-04 13:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27a781cd2b1b5e4b6298e1b61f06a89b SHA-1: ff2da883f4cd77541303e62966a2548fdd6455be SHA-256: c87d0553287804d6b853747ff1f81695f701c122c274f82c6c8e670aceb8e96e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The presence of numerous PDF_URI and PDF_SEO_LINK_FARM heuristics confirms the link farm behavior. The embedded URLs likely serve as entry points for further malicious activity.

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://waupundowntownpromotions.com/uploads/1/3/0/9/130969254/130969254.html#caracter%C3%ADsticas+de+vida+del+australopithecus+robustus
    • http://ericfairlayman.com/uploads/1/3/0/7/130776779/pekufigagukaji.pdf
    • http://romebee.com/uploads/1/3/0/8/130874143/7130619.pdf
    • http://victoriaproofing.com/uploads/1/3/0/3/130323794/dumakofonevixal.pdf
    • http://4hisgloryrgv.com/uploads/1/3/0/6/130604824/9e22594e4011.pdf
    • http://molivery.ee/uploads/1/3/0/7/130776111/sesitiwuj_ligej.pdf
    • http://adhere2care.net/uploads/1/3/0/2/130273913/delezupagu.pdf
    • http://fetchenergy.com/uploads/1/3/0/8/130813378/fenezavit.pdf
    • http://eelasor.com/uploads/1/3/0/3/130323162/fepanofemul.pdf
    • http://reneaugoatfarm.com/uploads/1/3/1/3/131398197/xobinomugoxes.pdf
    • http://clutchstuff.net/uploads/1/3/0/6/130640063/budufaned.pdf
    • http://saveourveterans.org/uploads/1/3/0/3/130323430/xabavadizojuti-saxotupeso-jomotibasipatu-watojedadile.pdf
    • http://cheshirecounsellingandpsychotherapy.com/uploads/1/3/0/6/130639532/c854dbcce8.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_off00006d2f.bin
768323d0028598fb4e6cdfe7c66aaa8a9304e8afd59dbb4ed6f729ca0a1ef841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 10552 bytes

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