Malicious PDF — malware analysis report

Static analysis result for SHA-256 e747f3e0b536a6ac…

MALICIOUS

PDF

45.2 KB Created: 2020-03-23 17:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4d4d1be40dc0955b6d141184a445c98 SHA-1: 5ccd82364230aec3cd5fcdfb4870365f0d16e564 SHA-256: e747f3e0b536a6acb62eaa40ba21187fb346f349dcf9d976fde48db31816370d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a link farm strategy, likely for SEO manipulation or to distribute further malicious content.

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://thecornerchef.org/uploads/1/3/0/6/130605018/130605018.html#products+that+contain+corn+based+ingredients
    • http://www.myboomx.com/uploads/1/3/0/4/130435666/8340652521a.pdf
    • http://politicallycorrectnot.com/uploads/1/3/0/3/130324137/woseg.pdf
    • http://tennineeightyfour.com/uploads/1/3/0/6/130621663/3115794.pdf
    • http://theoverhumans.com/uploads/1/3/0/7/130775584/dibumamiv.pdf
    • http://mochah.com/uploads/1/3/0/9/130969931/1829652.pdf
    • http://mrwilsonpioneer.com/uploads/1/3/0/6/130604341/wojurejudikaj-gixid-detemajusad.pdf
    • http://bifemecanico.com/uploads/1/3/0/5/130589135/lekafevitiw.pdf
    • http://al7erak247.com/uploads/1/3/0/5/130590462/5631512.pdf
    • http://archlegacy.com/uploads/1/3/0/6/130620279/2804499.pdf
    • http://www.wwcodehackathon.com/uploads/1/3/0/5/130551589/1917319.pdf
    • http://sueventions.com/uploads/1/3/0/7/130739247/sanidesejuged-revofejet.pdf
    • http://notingwell.com/uploads/1/3/0/6/130621401/68c50b.pdf
    • http://alphaconstructiondevelopment.com/uploads/1/3/0/7/130739371/db63199b79.pdf
    • http://purposeinlife.info/uploads/1/3/0/7/130776002/5522984.pdf
    • http://underlineconnections.com/uploads/1/3/0/5/130551718/jawiver-rewupevedolodeg-gozomujug.pdf
    • http://www.davinacreates.com/uploads/1/3/0/2/130287472/xupezuxetibejoposozi.pdf
    • http://thesilverpennyjewelry.com/uploads/1/3/0/2/130272348/1a6166b0c9e399.pdf
    • http://mail.flownroll.com/uploads/1/3/0/4/130476821/ec6a0cc404.pdf
    • http://divorcecoachchicago.com/uploads/1/3/0/7/130740385/majofirowimaw_famusofuv.pdf
    • http://jassentawil.net/uploads/1/3/0/6/130604126/mulemuxosexufuz.pdf
    • http://procreditsol.com/uploads/1/3/0/2/130272509/cdb65baf.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_off000084fc.bin
17eb1e920a372bf15d674afb51a32491986088d5e9c1260171a41d706482050a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 8460 bytes

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