Malicious PDF — malware analysis report

Static analysis result for SHA-256 04af307e4a5804fb…

MALICIOUS

PDF

48.3 KB Created: 2020-04-05 03:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32976c843eccc84f23927d7e22e4db83 SHA-1: d428d18c4ad4fb6158395bff6262e9f4348116ad SHA-256: 04af307e4a5804fb6e6237cd290b0c1e07b80a5f2516992f6186d2346a1b373a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a phishing or redirection attack pattern. No scripts were extracted, but the structure suggests a potential for JavaScript execution if the PDF were crafted to exploit vulnerabilities.

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://peakathleticsystems.com/uploads/1/3/1/4/131437603/131437603.html#formula+desarrollada+de+butanoato+de+etilo
    • http://noahco301cportfolio.com/uploads/1/3/1/3/131379059/1af111fc4558d24.pdf
    • http://hatsbydonchilo.com/uploads/1/3/0/7/130740049/xisugevexezinigipi.pdf
    • http://migrantliteraturejournal.com/uploads/1/3/0/6/130639356/271173.pdf
    • http://zonika.international/uploads/1/3/0/6/130621596/najakesunu_kolifuwitutepa_rarojin.pdf
    • http://blissedoutyoga.ca/uploads/1/3/1/0/131070469/dezovaruwuruboz_kewixinogipuweb_kotitigadun.pdf
    • http://o2skinrenu.com/uploads/1/3/0/6/130621392/ditiwugifeminudelane.pdf
    • http://educatingoutsidethebox.com/uploads/1/3/0/6/130639699/dekifovetituzepimot.pdf
    • http://queenofwandstarot.net/uploads/1/3/1/4/131406798/9861346.pdf
    • http://northdiamondcapital.ca/uploads/1/3/0/6/130620763/fuxevedirivonidadaz.pdf
    • http://husaynjamal.ca/uploads/1/3/0/7/130775071/tojafunoxu.pdf
    • http://donovanhendrick.com/uploads/1/3/0/5/130588961/051fbe.pdf
    • http://aurorafoxdesign.com/uploads/1/3/0/8/130813841/d7fc875525659.pdf
    • http://metroplano.com/uploads/1/3/0/4/130488179/folop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f6a.bin
c52c0329e072156ca521ff51c55980617e9d9589a72625d280d16ebb3296dbb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 9844 bytes
font_01_sfnt_off00009226.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9226 2652 bytes
font_02_sfnt_off00009b8d.bin
ca8da42182549437642b994f1d98ab0d5ae961db230b34fbe9ae9bf0528181cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8D 16336 bytes