Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbf40d4656dfed3…

MALICIOUS

PDF

48.3 KB Created: 2020-03-29 12:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d73eb25a6c3ba9e79711a0c92b50291 SHA-1: 75a2cd091b8ad1f9e9b6372b9c01c1ba591d0389 SHA-256: 6bbf40d4656dfed3094f39e8abe962ab1bdbfec6f93dc5304bb1cdec63cc3732
96 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. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a link farm intended to distribute malicious content. The embedded URL and the document body text, though obfuscated, point towards a lure to visit external resources.

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://myentouragemusic.com/uploads/1/3/0/6/130621912/130621912.html#the+whipping+boy+book+review
    • http://direccionsolex.net/uploads/1/3/0/5/130589244/65bc718b9.pdf
    • http://yourofiz.com/uploads/1/3/0/7/130740440/gexubuvo_feworo.pdf
    • http://adesignedtransformation.net/uploads/1/3/0/4/130483279/4482b445d9b46.pdf
    • http://uppitcrowdfunding.com/uploads/1/3/0/5/130588692/lupadukirikuwud.pdf
    • http://mirandaskilouraki.com/uploads/1/3/0/7/130776273/3184851.pdf
    • http://aspaceintime.net/uploads/1/3/0/4/130489226/1771551.pdf
    • http://knowyourbone.com/uploads/1/3/0/6/130620916/jibageviruliwewi.pdf
    • http://mta-sts.mail.sheglowsartistry.com/uploads/1/3/1/3/131379103/8773956.pdf
    • http://meganrhiannemua.com/uploads/1/3/0/7/130740318/sifizaxopi.pdf
    • http://lgdans.com/uploads/1/3/0/7/130738949/f837c6780.pdf
    • http://alterationsokc.com/uploads/1/3/0/5/130539908/vezipuvomabedemerisa.pdf
    • http://sendingangels.net/uploads/1/3/0/6/130621608/32c668456b.pdf
    • http://ktkteam.com/uploads/1/3/0/2/130270781/tajebekal_kipozujexakezof_lewipuralejekok_rikadojuba.pdf
    • http://patelliswrites.com/uploads/1/3/0/6/130604903/beac96.pdf
    • http://caniborrowthat.net/uploads/1/3/0/7/130738944/8169032.pdf
    • http://cityonahillcommunityoutreach.org/uploads/1/3/0/6/130604254/bamovav.pdf
    • http://course-group.com/uploads/1/3/0/7/130739756/2774072.pdf
    • http://beeremunah.com/uploads/1/3/0/5/130546457/mevadidexusuxav.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_off000096e4.bin
91192518eb5266eef432c87e6891207515c72af2ddfa45845636729322ac713c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E4 7252 bytes

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