Malicious PDF — malware analysis report

Static analysis result for SHA-256 632c5ea7e3ba24ca…

MALICIOUS

PDF

33.3 KB Created: 2020-04-05 04:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5bb2f262254ae6b48899a7648a8790f7 SHA-1: 748ef4d76ca1e2299f3611e36c7a9609de817ec8 SHA-256: 632c5ea7e3ba24ca407f5054e84b74045f6cbb7eb55f28710c9d3e88f83a8ecc
104 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are structured as a link farm, suggesting a malicious intent to redirect users. The document body explicitly mentions "Free download driver brother mfc-t800w", indicating a lure to trick users into downloading potentially harmful software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://festifbox.fr/uploads/1/3/0/3/130379219/130379219.html#free+download+driver+brother+mfc-t800w
    • http://billshomeinspections.com/uploads/1/3/0/5/130539517/4877683.pdf
    • http://essentialwellness4women.net/uploads/1/3/1/4/131454699/zitufevejavaxile.pdf
    • http://deb-rayes.com/uploads/1/3/1/3/131383329/4770000.pdf
    • http://neverbetterfishingcharters.com/uploads/1/3/0/2/130289427/suropofep.pdf
    • http://cadecim.com/uploads/1/3/0/4/130435941/61b1bf3.pdf
    • http://cosmedics.gr/uploads/1/3/1/4/131410094/a77593974a9.pdf
    • http://britguitars.com/uploads/1/3/0/5/130539875/6f211a811118300.pdf
    • http://www.housecandy.co.nz/uploads/1/3/0/5/130551536/nasogom-puvizibesesawin.pdf
    • http://arrowheadacupuncture.com/uploads/1/3/0/7/130739437/441352.pdf
    • http://digitaldietsonlinereviews.com/uploads/1/3/0/7/130739024/wopan.pdf
    • http://the-whole-thing.com/uploads/1/3/0/6/130604025/fe451.pdf
    • http://littleragquilt.com/uploads/1/3/1/4/131409035/bugaku_tobori_xuvuvuxuxoxe_weretudi.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_off00005b15.bin
af34034a08e6e2641c67492cf52b928ef9a6193f3822721632443496d4527dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B15 7372 bytes

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